Stent implantation methods for treatment of abdominal aortic aneurysms (AAA)Or Hananel
The objective of this review is to show different types of treatment for abdominal
aortic aneurysms (AAA) - compare and evaluate the effectiveness of the
treatments.
The assessment of right ventricular (RV) function remains one of the
most challenging and technically difficult tasks in echocardiography.
There are many anatomic and functional peculiarities that distinguish
the RV from the left ventricle, which pose significant challenges to the
conventional echocardiographic assessment of RV function and preclude the extrapolation of the knowledge and evidence accumulated
for the left side to the RV.
In the last years, RV strain imaging emerged as a superior metric of
RV systolic performance, overcoming some of the limitations of conventional echocardiographic parameters.1 RV longitudinal strain can
be measured by both tissue Doppler imaging and speckle-tracking
echocardiography (STE) techniques. The advantages of using the
speckle-tracking over the Doppler tissue imaging technique rely on
the independency of the measurements from the angle of insonation
and better reproducibility. Moreover, RV longitudinal strain measured using 2D STE has shown to be clinically useful in patients with
arrhythmogenic RV cardiomyopathy,2 and to have strong prognostic
value in a variety of diseases3 and also in the general population of
patients undergoing clinically indicated echocardiography.4
The following article is intended to provide guidance on how to reliably achieve accurate and reproducible measurements of RV strain.
All recommendations are in-line with the recently published joint
European Association of Cardiovascular Imaging/American Society of
Echocardiography consensus document on the same topic.
Design and Development of Arm Manikin for Blood Pressure and Pulse Simulation IJMER
The purpose of this study is to develop an arm manikin for oscillometric methods of blood
pressure measurement over full clinical range of blood pressure, heart rate. Blood pressure
simulator helps to resolve the uncertainties common in teaching students to take blood pressure.
Simulator allows the pre-setting of values for both systolic and diastolic pressures and provides an
excellent means to practice listening and distinguishing blood pressure sounds prior to actual
clinical experience. With this realistic unit, the student can find the preset results and the instructor
can unfailingly know if the student has performed the procedure accurately. The arm manikin is a
mould made up of rexine material which is coated with ethaflex as a skin material. A small rubber
tube is used as blood vessel and a small micro-speaker for heart beat listening. An external electronic
box is used to make students do the whole practice of blood pressure and pulse measurement. The
compressed air with 2x2 NC solenoid valve and other pneumatic accessories are used to create the
artificial pulses. A small micro-speaker with pre-recorded sound is used to generate heart beating
sound in the antecubital area. A blood pressure sensor MPX5050GP is used to sense the
sphygmomanometer dial pressure. PCB designed using a 16-bit micro-controller with on-chip ADC
and DAC. It has five keys and graphical 16x2 LCD for setting the simulation parameters including
the heart rate, systolic pressure, diastolic pressure.
An Exercise Tolerance Test or Stress Test records the heart's electrical activity (rate and rhythm) during exercise.
It is one of the commonest forms of stress tests used to induce provoke cardiac ischemia for diagnostic evaluation of coronary artery disease.
Braun F. et al.: Comparing belt positions for monitoring the descending aorta...Hauke Sann
Swisstom Scientific Library; 15th International Conference on Biomedical Applications of Electrical Impedance Tomography, Gananoque, Ontario, Canada, April 24-26, 2014
Stent implantation methods for treatment of abdominal aortic aneurysms (AAA)Or Hananel
The objective of this review is to show different types of treatment for abdominal
aortic aneurysms (AAA) - compare and evaluate the effectiveness of the
treatments.
The assessment of right ventricular (RV) function remains one of the
most challenging and technically difficult tasks in echocardiography.
There are many anatomic and functional peculiarities that distinguish
the RV from the left ventricle, which pose significant challenges to the
conventional echocardiographic assessment of RV function and preclude the extrapolation of the knowledge and evidence accumulated
for the left side to the RV.
In the last years, RV strain imaging emerged as a superior metric of
RV systolic performance, overcoming some of the limitations of conventional echocardiographic parameters.1 RV longitudinal strain can
be measured by both tissue Doppler imaging and speckle-tracking
echocardiography (STE) techniques. The advantages of using the
speckle-tracking over the Doppler tissue imaging technique rely on
the independency of the measurements from the angle of insonation
and better reproducibility. Moreover, RV longitudinal strain measured using 2D STE has shown to be clinically useful in patients with
arrhythmogenic RV cardiomyopathy,2 and to have strong prognostic
value in a variety of diseases3 and also in the general population of
patients undergoing clinically indicated echocardiography.4
The following article is intended to provide guidance on how to reliably achieve accurate and reproducible measurements of RV strain.
All recommendations are in-line with the recently published joint
European Association of Cardiovascular Imaging/American Society of
Echocardiography consensus document on the same topic.
Design and Development of Arm Manikin for Blood Pressure and Pulse Simulation IJMER
The purpose of this study is to develop an arm manikin for oscillometric methods of blood
pressure measurement over full clinical range of blood pressure, heart rate. Blood pressure
simulator helps to resolve the uncertainties common in teaching students to take blood pressure.
Simulator allows the pre-setting of values for both systolic and diastolic pressures and provides an
excellent means to practice listening and distinguishing blood pressure sounds prior to actual
clinical experience. With this realistic unit, the student can find the preset results and the instructor
can unfailingly know if the student has performed the procedure accurately. The arm manikin is a
mould made up of rexine material which is coated with ethaflex as a skin material. A small rubber
tube is used as blood vessel and a small micro-speaker for heart beat listening. An external electronic
box is used to make students do the whole practice of blood pressure and pulse measurement. The
compressed air with 2x2 NC solenoid valve and other pneumatic accessories are used to create the
artificial pulses. A small micro-speaker with pre-recorded sound is used to generate heart beating
sound in the antecubital area. A blood pressure sensor MPX5050GP is used to sense the
sphygmomanometer dial pressure. PCB designed using a 16-bit micro-controller with on-chip ADC
and DAC. It has five keys and graphical 16x2 LCD for setting the simulation parameters including
the heart rate, systolic pressure, diastolic pressure.
An Exercise Tolerance Test or Stress Test records the heart's electrical activity (rate and rhythm) during exercise.
It is one of the commonest forms of stress tests used to induce provoke cardiac ischemia for diagnostic evaluation of coronary artery disease.
Braun F. et al.: Comparing belt positions for monitoring the descending aorta...Hauke Sann
Swisstom Scientific Library; 15th International Conference on Biomedical Applications of Electrical Impedance Tomography, Gananoque, Ontario, Canada, April 24-26, 2014
Sequential segmental approach to congenital heart diseaseRamachandra Barik
The sequential segmental approach is essential for better understanding of cardiac anatomy in normal and malformed hearts. It is based on
a detailed analysis of the three main cardiac segments, namely atria, ventricles, and great vessels, and the two connecting segments, namely
atrioventricular and ventriculoarterial connections. Each segment is systematically defined based purely on its morphological characteristics.
In most cases, echocardiography is sufficient, but some cases necessitate the use of other imaging modalities. Systematic identification of
different segments, connections, and their abnormalities helps in making an accurate diagnosis of congenital heart disease (CHD). This review
provides a brief description of the sequential segmental approach for detecting CHD on echocardiography
Hemodynamic assessment of partial mechanical circulatory support: data derive...Paul Schoenhagen
Partial mechanical circulatory support represents a new concept for the treatment of advanced heart failure. The Circulite Synergy Micro Pump®, where the inflow cannula is connected to the left atrium and the outflow cannula to the right subclavian artery, was one of the first devices to introduce this concept to the clinic. Using computational fluid dynamics (CFD) simulations, hemodynamics in the aortic tree was visualized and quantified from computed tomography angiographic (CTA) images in two patients. A realistic computational model was created by integrating flow information from the native heart and from the Circulite device. Diastolic flow augmentation in the descending aorta but competing/antagonizing flow patterns in the proximal innominate artery was observed. Velocity time curves in the ascending aorta correlated well with those in the left common carotid, the left subclavian and the descending aorta but poorly with the one in the innominate. Our results demonstrate that CFD may be useful in providing a better understanding of the main flow patterns in mechanical circulatory support devices.
STUDY ON CEREBRAL ANEURYSMS: RUPTURE RISK PREDICTION USING GEOMETRICAL PARAME...mlaij
We modeled an SVM radial classification machine learning algorithm to determine the ruptured and unruptured risk of saccular cerebral aneurysms using 60 samples with 6 predictors as the gender, the age, the Womersley number, the Time-Averaged Wall Shear Stress (TAWSS), the Aspect Ratio (AR) and the bottleneck of the aneurysms, considering real cases of patients. We reconstructed computationally each geometry from an angiography image to realize a CFD simulations, where the TAWSS was computed by CFD analysis. A cross validation method was used in the training sample to validate the classification model, getting an accuracy of 92.86% in the test sample. This result may be used to help in medical decisions to avoid a complicated operation when the probability of rupture is low.
A systematic segmental analysis of cardiovascular anatomy is
essential for optimal management of patients with congenital
heart disease (CHD). Understanding cardiac anatomy is integral
to the pediatric cardiology training, while it is much less
discussed among adult cardiologists and echocardiographers.
Nonetheless, it is not uncommon for an adult cardiologist and
echocardiographers to encounter a patient with unrepaired or
repaired CHD. Therefore, it is important to understand the
basics of sequential segmental approach. Besides, the uniform
use of such an approach helps in easy communication among
team members managing a patient with suspected CHD.
For obvious reasons, while most anatomic details are well
delineated on echocardiography, it is not always possible to
demonstrate all aspects of cardiac anatomy and necessitate the
use of other imaging modalities. In this article, we provide a
brief description of the sequential segmental approach to cardiacanatomy with an emphasis on echocardiographic evaluation.
Early Detection of Left Ventricular Dysfunction in Type II Diabetic Patients ...Premier Publishers
To assess Left ventricular (LV) systolic dysfunction using 2D speckle tracking echocardiography (STE) in asymptomatic type II Diabetic patients. We acquired three LV short-axis, and three LV apical views in 100 asymptomatic diabetic patients with normal LV ejection fraction (EF) and 25 age-matched healthy volunteers. We measured end-systolic longitudinal strain (LS), radial strain (RS), and circumferential strain (CS) in 18 LV segments. There were no significant differences in LVEF between two groups. Diabetic patients had more advanced diastolic dysfunction and increased LV mass compared with controlled group. Basal, middle, and apical LSs were significantly lower in diabetic patients compared with control subjects, with 43% (43/100) of the diabetic patients showing abnormal global LS values (cut-off value: 217.2 mean 2SD in control subjects Conclusion: Detecting subclinical LV systolic dysfunction by using 2D speckle tracking echocardiography (STE) might provide useful information of the risk stratification in an asymptomatic diabetic population.
The morphologic and functional study of cardiovascular system is of vital importance because problems related to this system are one of the main causes of mortality in the world. It is important to mention that the left ventricle (VI) is the most susceptible to suffer severe damage, in diseases, such as arterial hypertension, mellitus diabetes or arteriosclerosis. This article presents a new methodology directed to segmentation of left ventricular contours, in angiographic images by using Generalized Hough Transform (TGH). It is important to obtain the ventricular edge, because analyzing processes of systole and diastole end, it is possible to calculate parameters of the cardiac functionality as the end-diastolic volume, end systolic volume, ejection fraction, cardiac output, Hyperkinéticos, Hypokinéticos segments, and normal; in this work we focus only on the removal of the same. For the system implementation, it was used some technics such binarization contrast enhancement, ordering points, filtering, mathematical morphology, b-spline and the TGH, that improved the ventricular visibility contour, highlighting data of interest, eliminating or reducing the effect of present structures such as ribs, catheter and segmented automatically the ventricular contour. The system was validated using 10 studies of angiography, obtained in the Instituto Autónomo Hospital Universitario of the Universidad de los Andes (I.A.H.U.L.A.), Merida, Venezuela. The percentage of generalized error performing the comparison of the manual segmentation and automating segmentation was 3.54%+_ 0.2 taken as a basis the Pearson correlation coefficient. Throughout the work demonstrates the functionality and applicability of the technique for the detection of ventricular edge in angiographic images. In future works is expected to supplement this analysis with the calculation of the descriptors of the cardiac functionality.
Background: Management of large and massive rotator cuff tears remains controversial. Such tears are often irreparable, and results of treatment are unpredictable. This study documents the current
practice of orthopaedic surgeons in the British Elbow and Shoulder Society.
Methods: A questionnaire was prepared pertaining to the management of large and massive rotator cuff tears with minimal degenerative changes in three age groups: Patients of 50 years (young), 65 years (still active), aged 75 years (elderly) were considered. Various risk factors for failure of repair were
considered.
Sequential segmental approach to congenital heart diseaseRamachandra Barik
The sequential segmental approach is essential for better understanding of cardiac anatomy in normal and malformed hearts. It is based on
a detailed analysis of the three main cardiac segments, namely atria, ventricles, and great vessels, and the two connecting segments, namely
atrioventricular and ventriculoarterial connections. Each segment is systematically defined based purely on its morphological characteristics.
In most cases, echocardiography is sufficient, but some cases necessitate the use of other imaging modalities. Systematic identification of
different segments, connections, and their abnormalities helps in making an accurate diagnosis of congenital heart disease (CHD). This review
provides a brief description of the sequential segmental approach for detecting CHD on echocardiography
Hemodynamic assessment of partial mechanical circulatory support: data derive...Paul Schoenhagen
Partial mechanical circulatory support represents a new concept for the treatment of advanced heart failure. The Circulite Synergy Micro Pump®, where the inflow cannula is connected to the left atrium and the outflow cannula to the right subclavian artery, was one of the first devices to introduce this concept to the clinic. Using computational fluid dynamics (CFD) simulations, hemodynamics in the aortic tree was visualized and quantified from computed tomography angiographic (CTA) images in two patients. A realistic computational model was created by integrating flow information from the native heart and from the Circulite device. Diastolic flow augmentation in the descending aorta but competing/antagonizing flow patterns in the proximal innominate artery was observed. Velocity time curves in the ascending aorta correlated well with those in the left common carotid, the left subclavian and the descending aorta but poorly with the one in the innominate. Our results demonstrate that CFD may be useful in providing a better understanding of the main flow patterns in mechanical circulatory support devices.
STUDY ON CEREBRAL ANEURYSMS: RUPTURE RISK PREDICTION USING GEOMETRICAL PARAME...mlaij
We modeled an SVM radial classification machine learning algorithm to determine the ruptured and unruptured risk of saccular cerebral aneurysms using 60 samples with 6 predictors as the gender, the age, the Womersley number, the Time-Averaged Wall Shear Stress (TAWSS), the Aspect Ratio (AR) and the bottleneck of the aneurysms, considering real cases of patients. We reconstructed computationally each geometry from an angiography image to realize a CFD simulations, where the TAWSS was computed by CFD analysis. A cross validation method was used in the training sample to validate the classification model, getting an accuracy of 92.86% in the test sample. This result may be used to help in medical decisions to avoid a complicated operation when the probability of rupture is low.
A systematic segmental analysis of cardiovascular anatomy is
essential for optimal management of patients with congenital
heart disease (CHD). Understanding cardiac anatomy is integral
to the pediatric cardiology training, while it is much less
discussed among adult cardiologists and echocardiographers.
Nonetheless, it is not uncommon for an adult cardiologist and
echocardiographers to encounter a patient with unrepaired or
repaired CHD. Therefore, it is important to understand the
basics of sequential segmental approach. Besides, the uniform
use of such an approach helps in easy communication among
team members managing a patient with suspected CHD.
For obvious reasons, while most anatomic details are well
delineated on echocardiography, it is not always possible to
demonstrate all aspects of cardiac anatomy and necessitate the
use of other imaging modalities. In this article, we provide a
brief description of the sequential segmental approach to cardiacanatomy with an emphasis on echocardiographic evaluation.
Early Detection of Left Ventricular Dysfunction in Type II Diabetic Patients ...Premier Publishers
To assess Left ventricular (LV) systolic dysfunction using 2D speckle tracking echocardiography (STE) in asymptomatic type II Diabetic patients. We acquired three LV short-axis, and three LV apical views in 100 asymptomatic diabetic patients with normal LV ejection fraction (EF) and 25 age-matched healthy volunteers. We measured end-systolic longitudinal strain (LS), radial strain (RS), and circumferential strain (CS) in 18 LV segments. There were no significant differences in LVEF between two groups. Diabetic patients had more advanced diastolic dysfunction and increased LV mass compared with controlled group. Basal, middle, and apical LSs were significantly lower in diabetic patients compared with control subjects, with 43% (43/100) of the diabetic patients showing abnormal global LS values (cut-off value: 217.2 mean 2SD in control subjects Conclusion: Detecting subclinical LV systolic dysfunction by using 2D speckle tracking echocardiography (STE) might provide useful information of the risk stratification in an asymptomatic diabetic population.
The morphologic and functional study of cardiovascular system is of vital importance because problems related to this system are one of the main causes of mortality in the world. It is important to mention that the left ventricle (VI) is the most susceptible to suffer severe damage, in diseases, such as arterial hypertension, mellitus diabetes or arteriosclerosis. This article presents a new methodology directed to segmentation of left ventricular contours, in angiographic images by using Generalized Hough Transform (TGH). It is important to obtain the ventricular edge, because analyzing processes of systole and diastole end, it is possible to calculate parameters of the cardiac functionality as the end-diastolic volume, end systolic volume, ejection fraction, cardiac output, Hyperkinéticos, Hypokinéticos segments, and normal; in this work we focus only on the removal of the same. For the system implementation, it was used some technics such binarization contrast enhancement, ordering points, filtering, mathematical morphology, b-spline and the TGH, that improved the ventricular visibility contour, highlighting data of interest, eliminating or reducing the effect of present structures such as ribs, catheter and segmented automatically the ventricular contour. The system was validated using 10 studies of angiography, obtained in the Instituto Autónomo Hospital Universitario of the Universidad de los Andes (I.A.H.U.L.A.), Merida, Venezuela. The percentage of generalized error performing the comparison of the manual segmentation and automating segmentation was 3.54%+_ 0.2 taken as a basis the Pearson correlation coefficient. Throughout the work demonstrates the functionality and applicability of the technique for the detection of ventricular edge in angiographic images. In future works is expected to supplement this analysis with the calculation of the descriptors of the cardiac functionality.
Background: Management of large and massive rotator cuff tears remains controversial. Such tears are often irreparable, and results of treatment are unpredictable. This study documents the current
practice of orthopaedic surgeons in the British Elbow and Shoulder Society.
Methods: A questionnaire was prepared pertaining to the management of large and massive rotator cuff tears with minimal degenerative changes in three age groups: Patients of 50 years (young), 65 years (still active), aged 75 years (elderly) were considered. Various risk factors for failure of repair were
considered.
Assessment of Intermediate Coronary Artery Lesion with Fractional Flow Reserv...Premier Publishers
Fraction flow reserve (FFR) is considered the gold standard for assessing intermediate coronary lesions. Retrospective data analyses showed variable relationship between intravascular ultrasound (IVUS) parameters and FFR results. This study aimed to determine the optimal minimum lumen area (MLA) by IVUS that correlates with FFR and to assess the correlation between two modalities in assessing intermediate coronary lesions. Methods: Fifty eight intermediate coronary lesions mainly located in proximal and mid segments of large main coronary vessels with RVD (3-4mm) were analyzed using both IVUS and FFR to assess the significance of coronary stenting and to determine the optimal IVUS-MLA that correlates with FFR value < 0.8. Results: IVUS-MLA ranged from 2.5 to 4.2 mm2 had a highly significant positive correlation with FFR value < 0.8 (p < 0.0001). Using the ROC curve analysis, IVUS-MLA < 3.9 mm2 (84.2% sensitivity, 80% specificity, area under curve (AUC) = 0.68) was the best threshold value for identifying FFR <0.8>< 0.8 in coronary vessels with RVD (3-4mm). Different MLA cutoffs should be used for different vessel diameters.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Understanding Inductive Bias in Machine LearningSUTEJAS
This presentation explores the concept of inductive bias in machine learning. It explains how algorithms come with built-in assumptions and preferences that guide the learning process. You'll learn about the different types of inductive bias and how they can impact the performance and generalizability of machine learning models.
The presentation also covers the positive and negative aspects of inductive bias, along with strategies for mitigating potential drawbacks. We'll explore examples of how bias manifests in algorithms like neural networks and decision trees.
By understanding inductive bias, you can gain valuable insights into how machine learning models work and make informed decisions when building and deploying them.
Harnessing WebAssembly for Real-time Stateless Streaming PipelinesChristina Lin
Traditionally, dealing with real-time data pipelines has involved significant overhead, even for straightforward tasks like data transformation or masking. However, in this talk, we’ll venture into the dynamic realm of WebAssembly (WASM) and discover how it can revolutionize the creation of stateless streaming pipelines within a Kafka (Redpanda) broker. These pipelines are adept at managing low-latency, high-data-volume scenarios.
HEAP SORT ILLUSTRATED WITH HEAPIFY, BUILD HEAP FOR DYNAMIC ARRAYS.
Heap sort is a comparison-based sorting technique based on Binary Heap data structure. It is similar to the selection sort where we first find the minimum element and place the minimum element at the beginning. Repeat the same process for the remaining elements.
We have compiled the most important slides from each speaker's presentation. This year’s compilation, available for free, captures the key insights and contributions shared during the DfMAy 2024 conference.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
2. Strain Measurements of the
Thoracic Aorta
Determining the deformations and strains together
with known loading can give an indication of the
relative health of tissue.
What follows is the measurement of strains in the
human thoracic aorta.
3. Image Selection:
The end-diastolic and end-systolic images were
taken from the full cardiac cycle.
The difference image shows the extent of the
expansion of the aorta.
End-diastole End-systole
Template Target Difference
4. Model Creation
The aorta lumen manually segmented and an outer
surface was defined (left ). The outer surface
encompassed the 1.5 mm thickness of the aorta and
some of the adjacent connective tissue. These
surfaces were meshed using predominantly
hexahedral elements (right).
5. Registration Analysis
The registration analysis was completed.
Inner and outer Circumferential Strain
Inner and outer surfaces align with target image (left) indicating good global
registration. The strain results show an approximately 5% average
circumferential tensile strain within 2 mm of the lumen.These results agree
well with those of a middle aged patient. (Morrison et al. JVasc Surg.,2009 April ; 49(4):
1029–1036.)
6. Results/Discussion
These results document the amount of expansion
that this thoracic aorta undergoes over the cardiac
cycle.
The strain results could be used to back out the
aorta material properties as long as the aortic
pressure loading was known.
Brachial artery blood pressure (arm cuff)
measurements are very convenient and non-
invasive but overestimate (~12-18 mmHg) the
pressure loading on the aorta due to pressure wave
reflection. (Munir et al. Hypertension. 2008;51:112-118)
7. Results/Discussion Cont.
Pre-strain would need to be accounted for in order
for the material properties to have relevance.
If one needed to match the displacement
characteristics (compliance matching) of an implant
to the native aorta then the strain data from the
registration could be used together with a forward
model of the implant to create a design that would
have similar pressure/ displacement characteristics.
Editor's Notes
dilation which can provide valuable information on cardiac function and viability of diseased tissue.