An overview of Renography - the medical imaging of kidneys using Nuclear Medicine - including its advantages and disadvantages over other Radiographic imaging modalities.
An overview of Renography - the medical imaging of kidneys using Nuclear Medicine - including its advantages and disadvantages over other Radiographic imaging modalities.
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Cardiac SPECT – steady growth in last two decades & played an important role in clinical mangement
Radionuclide ventriculography (MUGA)
First pass studies
PET/CT
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Title: Sense of Smell
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the primary categories of smells and the concept of odor blindness.
Explain the structure and location of the olfactory membrane and mucosa, including the types and roles of cells involved in olfaction.
Describe the pathway and mechanisms of olfactory signal transmission from the olfactory receptors to the brain.
Illustrate the biochemical cascade triggered by odorant binding to olfactory receptors, including the role of G-proteins and second messengers in generating an action potential.
Identify different types of olfactory disorders such as anosmia, hyposmia, hyperosmia, and dysosmia, including their potential causes.
Key Topics:
Olfactory Genes:
3% of the human genome accounts for olfactory genes.
400 genes for odorant receptors.
Olfactory Membrane:
Located in the superior part of the nasal cavity.
Medially: Folds downward along the superior septum.
Laterally: Folds over the superior turbinate and upper surface of the middle turbinate.
Total surface area: 5-10 square centimeters.
Olfactory Mucosa:
Olfactory Cells: Bipolar nerve cells derived from the CNS (100 million), with 4-25 olfactory cilia per cell.
Sustentacular Cells: Produce mucus and maintain ionic and molecular environment.
Basal Cells: Replace worn-out olfactory cells with an average lifespan of 1-2 months.
Bowman’s Gland: Secretes mucus.
Stimulation of Olfactory Cells:
Odorant dissolves in mucus and attaches to receptors on olfactory cilia.
Involves a cascade effect through G-proteins and second messengers, leading to depolarization and action potential generation in the olfactory nerve.
Quality of a Good Odorant:
Small (3-20 Carbon atoms), volatile, water-soluble, and lipid-soluble.
Facilitated by odorant-binding proteins in mucus.
Membrane Potential and Action Potential:
Resting membrane potential: -55mV.
Action potential frequency in the olfactory nerve increases with odorant strength.
Adaptation Towards the Sense of Smell:
Rapid adaptation within the first second, with further slow adaptation.
Psychological adaptation greater than receptor adaptation, involving feedback inhibition from the central nervous system.
Primary Sensations of Smell:
Camphoraceous, Musky, Floral, Pepperminty, Ethereal, Pungent, Putrid.
Odor Detection Threshold:
Examples: Hydrogen sulfide (0.0005 ppm), Methyl-mercaptan (0.002 ppm).
Some toxic substances are odorless at lethal concentrations.
Characteristics of Smell:
Odor blindness for single substances due to lack of appropriate receptor protein.
Behavioral and emotional influences of smell.
Transmission of Olfactory Signals:
From olfactory cells to glomeruli in the olfactory bulb, involving lateral inhibition.
Primitive, less old, and new olfactory systems with different path
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Tom Selleck Health: A Comprehensive Look at the Iconic Actor’s Wellness Journeygreendigital
Tom Selleck, an enduring figure in Hollywood. has captivated audiences for decades with his rugged charm, iconic moustache. and memorable roles in television and film. From his breakout role as Thomas Magnum in Magnum P.I. to his current portrayal of Frank Reagan in Blue Bloods. Selleck's career has spanned over 50 years. But beyond his professional achievements. fans have often been curious about Tom Selleck Health. especially as he has aged in the public eye.
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Introduction
Many have been interested in Tom Selleck health. not only because of his enduring presence on screen but also because of the challenges. and lifestyle choices he has faced and made over the years. This article delves into the various aspects of Tom Selleck health. exploring his fitness regimen, diet, mental health. and the challenges he has encountered as he ages. We'll look at how he maintains his well-being. the health issues he has faced, and his approach to ageing .
Early Life and Career
Childhood and Athletic Beginnings
Tom Selleck was born on January 29, 1945, in Detroit, Michigan, and grew up in Sherman Oaks, California. From an early age, he was involved in sports, particularly basketball. which played a significant role in his physical development. His athletic pursuits continued into college. where he attended the University of Southern California (USC) on a basketball scholarship. This early involvement in sports laid a strong foundation for his physical health and disciplined lifestyle.
Transition to Acting
Selleck's transition from an athlete to an actor came with its physical demands. His first significant role in "Magnum P.I." required him to perform various stunts and maintain a fit appearance. This role, which he played from 1980 to 1988. necessitated a rigorous fitness routine to meet the show's demands. setting the stage for his long-term commitment to health and wellness.
Fitness Regimen
Workout Routine
Tom Selleck health and fitness regimen has evolved. adapting to his changing roles and age. During his "Magnum, P.I." days. Selleck's workouts were intense and focused on building and maintaining muscle mass. His routine included weightlifting, cardiovascular exercises. and specific training for the stunts he performed on the show.
Selleck adjusted his fitness routine as he aged to suit his body's needs. Today, his workouts focus on maintaining flexibility, strength, and cardiovascular health. He incorporates low-impact exercises such as swimming, walking, and light weightlifting. This balanced approach helps him stay fit without putting undue strain on his joints and muscles.
Importance of Flexibility and Mobility
In recent years, Selleck has emphasized the importance of flexibility and mobility in his fitness regimen. Understanding the natural decline in muscle mass and joint flexibility with age. he includes stretching and yoga in his routine. These practices help prevent injuries, improve posture, and maintain mobilit
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2. Introduction
Uses pharmaceuticals – labels with
radionuclides (radiopharmaceuticals) -
radiotracers
Administers these to patients – radiation
emitted is detected
Formation of an image using a gamma
camera or positron emission tomography
Radionuclide imaging / nuclear
scintigraphy
Shows the physiological function of the
system being investigated
3. Introduction
Radiotracers – DTPA, MAG3, OIH etc – taken up by
kidneys, then excreted into urinary tract
Serial frames of posterior view – acquired 20-30 min
immediately after tracer injection
Frame rate –
1-3s per frame for one min to assess perfusion
(perfusion phase)
10-15s per frame for 4 min to assess function
(function phase)
10-30s per frame to assess urinary system
(excretion phase)
4. Overview of renal
radiopharmaceuticals
Renal handling Radiopharmaceu
tical
Imaging Clinical use
Glomerular
filtration
51 Cr-EDTA No GFR
99mTc-DTPA Yes GFR
Tubular secretion 123I/131I-OIH Yes ERPF
99mTc-MAG3 Yes ERPF
99mTc-EC Yes ERPF
Tubular retention 99mTc-DMSA Yes Cortical imaging
99mTc-GH Yes Cortical imaging
5. Glomerular filtration
Gold standard – inulin clearance
Radionuclide of choice – 51Cr-EDTA – clearance
closest to that of inulin
99mTc-DTPA – technetium-99m-diethylenetriamine
pentaacetic acid – correlates well with 51Cr-EDTA and
inulin
• Taken up by glomerular filtration, not
secreted/reabsorbed by tubules
99mTc-DTPA can be used for gamma camera imaging
Least expensive renal radiopharmaceutical
Low radiation dose
Small fraction may be bound to protein – not a
problem for routine measurement of GFR
Once reaches kidney – 20% is accumulated and
remainder flows away, i.e. extraction fraction of DTPA
is 20%
6. Tubular secretion (1)
p-Aminohippuric acid (PAH) – gold standard
for measurement of tubular cell function and its
clearance – effective renal plasma flow (ERPF)
123I-OIH and 131I-OIH – cleared by tubular secretion
(small fraction by glomerular filtration)
Clearance rate – approx 500-600ml/min
Extraction of 131I-OIH depends on renal plasma flow
and extraction from plasma (proximal tubules)
123I-OIH – better imaging qualities, more expensive
7. Tubular secretion (2)
99mTc-MAG3
highly protein-bound, cleared mainly by
proximal tubules
High extraction fraction (50%) – better
scintigraphic images
99mTc-I, I and d,d-ethylenedicysteine
(EC) – better than 99mTc-MAG3
8. 65 year-old with contrast nephropathy on CKD – better image of TC-MAG than DTPA scan
9. Tubular retention
99mTc-dimercaptosuccinic acid (DMSA)
Excellent cortical imaging agent
Concentrates largely in renal cortex (lesser in liver)
Strongly bound to proteins
At 2h post-injection : 50% retained in kidneys, no
visualization of urinary collecting system
99mTc-glucoheptonate (GH)
Filtered by glomerulus and bound by tubules
Highly protein-bound – glomerular filtration partial
10. DMSA
IV injection – bound to proximal tubules
Indications:
Assessment of kidneys in acute phase of UTI
(acute pyelonephritis)
Assessment of kidneys in late phase of UTI –
detection of scar
Assessment of horseshoe, solitary or ectopic
kidney
Localisation of poor or very poorly functioning
kidney
Assessment of renal function in the presence of
an abdominal mass
BNMS guidelines
11. DMSA
Pitfalls
Acute and chronic pyelonephritis cannot be distinguished
on the cortical scan. If a defect is present 6 months after
the last UTI then this is a scar
A recent UTI may cause temporary reduced uptake / focal
defect and a follow-up DMSA scan should be undertaken
The diagnosis of renal scars is difficult in the infant under
3-6 months of age because of renal immaturity. If
appropriate the scan should be delayed
Controversies
To obtain the highest resolution, some centres recommend
the use of a pin hole collimator, however many institutions
obtain high resolution images with clear definition between
cortex and medulla without the use of pin-hole collimation
Currently there is no evidence to support the routine use of
SPECT in children to delineate focal defects
BNMS guidelines
12. Analytic methods
Various methods
Single-sample methods and camera-based
methods suitable for busy clinical practice
Single-sample – single venous blood sampling
after tracer injection, and plasma radioactivity
is measured
Plasma activity and injection dose
substituted in a predefined, empiric
equation = renal clearance
13. Analytic methods
Camera-based methods – renal uptake early
after tracer injection reflects renal function
Calculate renal function from imaging data without blood
sampling
A region of interest (ROI) is drawn for each kidney to
estimate activity, then do a background subtraction, then
attenuation correction for depth of each kidney, then
normalized to the injection dose – finally substituted to an
empiric equation = renal clearance
Less accurate than single-sample method
Can assess right and left kidney function separately – split
renal function
Can do combined single-sample and camera-based
methods
Isotopic Scan for Diagnosis of Renal Disease. Yusuke Inoue et al. Saudi Journal of Kidney Diseases and Transplantation. 15(3) 2004; 257-64
14. Analytic methods
Renogram curves – overview of the time
course of renal radioactivity
Generated by setting an ROI for each kidney
Radioactivity in a kidney derives from renal parenchyma,
upper tract and overlapping extrarenal tissues
Do background subtraction - renal parenchyma and upper
tract
In normal subjects – a renogram demonstrates rapid
increase during perfusion and function phases, then rapid
decline during excretion phases
Hypofunction flattens the slopes during the function and
excretion phases
Obstruction causes delayed excretion
Cannot discriminate between retention in renal
parenchyma and that in urinary tract – visual assessment
of scintigraphy images needed…
19. Glomerular Filtration Rate
Substances suitable for measuring
GFR
Low protein binding
Negligible non-renal excretion
Freely filtered
Chemically stable and inert
INULIN – Gold standard
20. GFR
Radioactive tracers – simplifies sample
measurements
Single injection
51Chromium ethylenediamine tetraacetic acid
(51Cr-EDTA) – agent of choice
99mTc-DTPA – can be used – prepared from
kits - variability in stability and protein-binding
Short half-life (6 hours)
Advantage – imaging and GFR measurement
can be performed at the same time
21. GFR - 51Cr-EDTA
After iv injection – EDTA rapidly diffuses
throughout bloodstream, equilibrates more
slowly with EVF
Measure the plasma conc at 2, 3 and 4
hours after injection
Back extrapolation to time of
injectiondistribution volume of extacellular
space, and slope of declining conc is
fractional clearance of this space GFR
Expressed in ml/min or normalised to body
surface area
22. GFR - 51Cr-EDTA
A number of attempts to simplify GFR
measurements
Considerable variation due to age and body
dimensions
High errors
All single injection methods – assume patient
in a steady state with respect to
hemodynamics and fluid exchange
Not accurate e.g. major surgery, transfusion
or dialysis
23. EDTA
GFR - plasma clearance curve - which required multiple
blood samples to be taken over a period of several hours
Slope-intercept method – after numerous simplification
number of sample : 1 (recommended by the
Radionuclides in Nephrology Committee on Renal
Clearance (Blaufox et al, 1996) )
It is recommended that the plasma clearance of EDTA
from venous samples be taken as the standard measure
of GFR
DTPA does have some technical advantages over EDTA
but normal ranges are not so well established
Small systematic differences have been observed
between GFR measurements obtained from EDTA and
DTPA (Rehling et al, 1984, Fleming et al, 1991, Biggi et
al, 1995)
24. Renal plasma flow
Tracers that are filtered and actively secreted
by renal tubules – extracted with efficiency
from plasma perfusing kidneys
Ortho-idohippurate (OIH) – 90% removed by
kidneys on a single pass ERPF
Less widely available
99mTc-labelled compounds – 99mTc-MAG3:
Higher protein binding and lower extraction efficiency
Tubular extraction rate
Need multiple blood samples for accuracy
26. Obstructive Uropathy
Obstruction of the urinary flow
anywhere from the renal pelvis to the
urethra
Can be acute or chronic
In adults most commonly caused by
tumor or prostatic enlargement
(hyperplasia or malignancy)
Need to have bilateral obstruction in
order to have renal insufficiency
27. Prenatal Hydronephrosis
Prenatal hydronephrosis (collecting
system dilatation) can be identified
on prenatal ultrasound in about 1% of
patients (0.3-4.5% and is bilateral in
37-57% of cases.
Followup is generally recommended if
the AP diameter of the collecting
system is 7-10 mm during the 3rd
trimester of pregnancy.
28. Prenatal Hydronephrosis
The first follow up exam should be
performed during the 1st week after
birth- but not during the first 72
hours because of reduced urine
output after delivery.
On post-natal follow-up, the dilatation
will resolve in 20-50% of cases.
29. Obstruction/Urinary tract
dilatation
Diuretic renography – diagnostic
work-up of upper tract dilatation, and
follow-up of patients with
hydronephrosis
Method of choice – to differentiate a
dilated unobstructed urinary system
from a true stenosis
Can also assess urine flow and renal
function
30. In children:
Sedation should be avoided – may interfere
with bladder voiding
Increased radiation exposure to bladder
mucosa – concern
Receiving the child with parents in a dedicated,
calm environment
If needed – local guidelines for sedation
Short inhalation of equimolar mixture of
nitrous oxide and oxygen
J Nucl Med 2006; 47:1819–1836
31. Diuretic renography
99mTc-mercaptoacetyltriglycine(MAG3) and
123I-orthoiodohippurate (OIH) are preferred
higher renal extraction ratio and rapid
plasma clearance, especially in infants and
young children and in patients with impaired
renal function
Use of frusemide 1mg/kg (max 20mg in
children, 40mg adults
Recommended by Society of Nuclear
Medicine
European Nuclear Medicine Association
32. Diuretic renography
Timing of frusemide administration
20 min or more after tracer injection – max
distension of renal pelvis or ureter can be
visually assessed (F+20)
15 min before tracer injection – diuretic
response of kidney is maximal (F-20)
Diuretic response is evaluated by visual and
quantitative interpretation of the dynamic
acquisition
Postmicturition images are mandatory because
a full bladder may delay urinary flow even in an
unobstructed system
33. Diuretic renography
The role of bladder catheterization – debated -
not recommended in clinical routine practice
Older children and adults - renography is
performed after bladder emptying
Non–toilet-trained children, spontaneous
micturition is usually observed during the
acquisition
Adequate functioning of the affected
kidney (GFR > 15 mL/min) and adequate
hydration are major determinants of the
response to frusemide
39. 4 year-old girl treated
conservatively for left PUJ
stenosis detected
prenatally
Left kidney
20min after injection After miction 50 min after injection
42. UTI
Frequent in children
Affect girls 2x > boys
80% first infections diagnosed during
first 2 years of life
5% in infants and young children –
fever of unexplained origin
Diagnosis – urine culture
Risk of renal damage – delay of
diagnosis/treatment, number of UTIs
43. UTI
The Subcommittee on Urinary Tract
Infection of the American Academy of
Pediatric Committee on Quality
Improvement recommended imaging
(mainly sonography, VCUG, or
radionuclide cystography) of the urinary
tract in children younger than 2 y old
but considered the role of cortical renal
scintigraphy still to be unclear despite
its recognized high sensitivity
44. Cortical scintigraphy
Scintigraphy with 99mTc-dimercaptosuccinic
acid (DMSA) – simple and non-invasive
Static imaging 2-4 hours after iv injection
Delayed or post-frusemide images in
hydronephrosis
The sensitivity of 99mTc-DMSA for the
detection of parenchymal defects due to
infection - from 80% to 100%
does not allow differentiation of acute
pyelonephritis from renal scars
45. Cortical scintigraphy
Abnormal findings on cortical scintigraphy are found in
52%–78% of children during acute pyelonephritis, and
the risk that a renal scar will develop can reach 60%
The role of cortical scintigraphy is still largely debated in
acute pyelonephritis but is widely accepted in the
detection of renal scars
99mTc-DMSA scintigraphy is the reference method
for detecting renal sequelae after UTI, is more
sensitive than sonography, and should be
performed no sooner than 6 mo after the last
documented UTI
Also used to detect scars in VUR
46.
47.
48.
49. Radionuclide cystography
Direct radionuclide cystograhy
A radiologic-VCUG alternative - lower
radiation burden
As invasive as VCUG – bladder
catheterization
More sensitive – acquisition is continuous in
both filling and voiding phase
Indirect radionuclide cystography
Performed after conventional renography with 99mTc-
MAG3 or 123I-OIH – high excretion rate
No need catheterization
Less sensitive and specific than VCUG/direct
cystography
56. Renovascular hypertension
3 – 5% of all hypertensive patients
15 – 30% of referred patients for refractory
hypertension
Renal hypoperfusion secondary
activation of renin-angiotension system
Stenotic or obstructive lesion within renal
artery
Potential curable cause of hypertension
70-90% - atherosclerosis
10-30% - fibromuscular dysplasia
57. Renovascular hypertension
RVH is a consequence of activation of RAS with
concomitant release of angiotensin II (a
vasoconstrictor) and aldosterone (leading to
plasma volume expansion) to maintain
physiologic renal perfusion by increasing blood
pressure
Clinical features:
abdominal bruits, rapid onset of hypertension,
refractory hypertension, unilateral renal atrophy,
azotemia (esp when worsened by ACEi or ARB),
unexplained azotemia/hypokemia
Episodes of flash pulmonary edema in patients with
relatively well-preserved systolic function
Gold standard – Renal angiography
58.
59. Captopril-enhanced renography
To determine which patients can expect normalization of
BP or improvement of BP control after revascularization
ACEi reduce the conversion of angiotensin I
angiotensin II - diminishing the vasoconstriction of the
postglomerular efferent arteriole and decreasing the
GFR, which can be detected by scintigraphy
Both glomerulus-filtered (99mTc-DTPA) and tubule-
secreted (99mTc-MAG3 or 123I-OIH) - currently used
ACEi – captopril (25-50mg) orally 60min before
renography; or iv enalaprilat (40mg/kg) over
325min >15min before renography
60. Captopril-enhanced renography
Known pitfalls erroneous results are
food ingestion within 4 h before receiving
captopril,
dehydration, hypotension,
or a full bladder impairing drainage
ACEi enhanced renography now is rarely used
as the primary imaging tool
Most reliable in predicting recovery in patients
with FMD
61. 35 year-old : Doppler ultrasound
showing parvus-tardus pattern with
collapsed resistance index
Normal right kidney
69. Renal transplantation
Comprehensive evaluation of renal transplants – in
differential diagnosis of medical and surgical
complications in early post-op and in long-term follow
up
Selection of patients for biopsy and for various drug
regimens
Anuric ATN – improving indices of renal function (ERPF,
uptake of tubular tracers) – indicates resolution of tubular
injury
The protocol: a flow study, scintigram of kidneys, prevoid
and postvoid bladder image, injection site image,
time/acitivity curves of graft and bladder, and quantitative
data of perfusion, function and tracer transit
Report of the Radionuclides in Nehrourology Committee for
evaluationof transplanted kidney (review of techniques).
Dubovsky et al. Semin Nucl Med. 1999 Apr;29(2):175-88
70. Renal transplantation
Flow study – 99mmercaptoacetyltriglycine or DTPA
Quantitative analysis and function phase should
include images and time/activity curves
Serial studies: decline in function and poor
perfusion indicative of acute rejection
A normally appearing scintigram without cortical
retention, low function – chronic rejection
Diuretic renogram - to exclude obstruction
Report of the Radionuclides in Nehrourology Committee for
evaluationof transplanted kidney (review of techniques).
Dubovsky et al. Semin Nucl Med. 1999 Apr;29(2):175-88
71. Renal transplantation
A baseline study should be performed
within 1 – 2 days of operation – to
allow comparison of serial studies
because of deteriorating renal
function
DTPA – tracer of choice in early
stages
DTPA/MAG3 can be used later stages
73. Renography in transplantation
Ultrasound – 1st line evaluation in
renal graft dysfunction
Renography – must be available on
emergency basis
Non-visualization – irremediable loss of function
May not differentiate rejection from ischemia
(RAS)
ACEi renography – help determine whether
arterial hypertension is dependent on RAS
Help in diagnosis of urinary complications –
obstruction or leak
79. Decreased graft function 5/12
post-transplant, renogram
showed an OIH accumulation
within normal limits, normal peak,
but delayed elimination
1-min images reveal tracer
retention in parenchyma without
outflow impairment – suggesting
potential CNI toxicity
80. Conclusion
Role of nuclear medicine – in investigation of
renal parenchymal function and upper urinary
tract abnormalities
Radiation burden low
Do not require sedation or specific patient
preparation
Easy to perform
Knowledge of renal patho-physiology and
recognition of limitation and technical pitfalls
essential