All the details are mentioned

1. MAGNETIC RESONANCE
IMAGING (MRI)
Presented By
K.Neelima
D. Yasaswini
S. Likitha

2. CONTENTS:
 INTRODUCTION
 ABOUT MRI
 BASIC PRINCIPLE
 COMPONENETS OF MRI
 WORKING MODEL OF MRI
 IMAGE WEIGHT
 MRI VS CT SCAN
 USES
 RISKS OF MRI SCAN

3. INTRODUCTION:
 Prof Peter Mansfield was awarded Noble prize in
2003 for his discovery in MRI with Prof Paul C
Lautenberg of USA.
 MRI is a type of scan that uses strong magnetic
fields and radio waves to produce detailed images
of inside of the body.
 MRI perhaps the best application of
superconductivity which directly affected the
humanity across the globe.
Prof Peter Mansfield Paul C Lautenberg

4. ABOUT MRI
 An MRI scanner is a large tube that contains
powerful magnets. You lie inside the tube during
scan.
 Magnetic resonance imaging is used to produce
three dimensional detailed anatomical images.
 It is based on sophisticated technology
 It is often used for disease detection.

5. BASIC PRINCIPLE:
 Human body is entirely comprised of
cells. Which contain water principally
made of Hydrogen ions.
 The Magnet embedded with in the
MRI Scanner can act on these
positively charged hydrogen ions.
 When the magnet is switched off the
protons will gradually return to their
original state in a process known as
precession.

6. COMPONENTS OF MRI
 Main magnet formed by super conducting coils.
 Gradient coil
 RF coils
 Computer system

7. WORKING OF MRI
 MRI’s employ powerful magnets which produce strong
magnetic field that forces protons in the body.
 Radio frequency current is pulsed through the patient.
 Contrast agents may be given to the patients.
(GADOLINIUM)

8. IMAGE WEIGHT:
 The Magnetic fields produced by the scanners can
be manipulated to produce two distinct types of
images. T1 weighted and T2 weighted.
 The resulting images will show different tissue
types in different densities.

9. MRI VS CT SCAN
CT SCAN MRI
Uses X- rays for imaging Uses large external field, RF
pulse and 3 different gradient
fields.
Exposure to ionizing radiation MRI machines do not emit
ionizing radiation.
Resolution problem. Good resolution & 3-D
reconstruction.
Injection of contrast medium.
(dye) can cause kidney.
Gadolinium contrast is
relatively nontoxic.
Problems or result in allergic or
injection – site reactions in some
people
More cost
Less cost than MRI.
Quick process and easily
available
Lengthy process and non
availability.

10. USES:
 MRI scanning is excellent for visualizing soft
tissue.
 They do not cost any radiation exposure to the
patient.
 It is used for disease detection, diagnosis and
treatment monitoring.
 MRI can differentiate between white matter and
grey matter.

11. RISKS:
 It does employ a strong magnetic field.
 The magnetic field extends beyond the machine
and exerts powerful forces on objects of iron, some
steels and other magnetic objects.
 The people with claustrophobia may find it difficult
to tolerate long scan times inside the machine.

12. THANK YOU