The document discusses magnetic resonance imaging (MRI), detailing its inventor, Raymond Vahan Damadian, and how MRI functions using large magnets and radio waves to create detailed body images without radiation. It covers the components of MRI, including superconducting and gradient coils, as well as radiofrequency coils that generate necessary pulses for imaging. Additionally, it contrasts closed and open MRI machines based on their magnetic field strength and image quality.

1. Magnetic Resonance
Imaging ( MRI )
Presented By :
Name : Reduan Ahmad
ID : 232-35-016
Section: A
Batch: 41

2. Who is the father of MRI ?
Raymond Vahan Damadian
(March 16, 1936 – August 3, 2022) was
an American physician, and inventor of
the first nuclear magnetic resonance
(NMR) scanning machine.

3. Table of contents
01
04
02
05
03
Introduction How MRI works Components of MRI
Equation Shape of MRI Machine

4. MRI :
● Big magnet and radio waves
take picture inside our body , no
radiation involved.
● Super clear body pictures, helps
doctors see problems with out
hunting us .
● Secret sauce of MRI , makes
detailed pictures possible .
Introduction
01

5. How MRI works
• Big magnet
• Radio waves
• Signal
• Picture

6. A superconducting magnet is the
heart and most expensive part
of an MRI scanner.
Gradient coils are used to
produce deliberate variations in
the main magnetic field
Components of MRI
Superconducting
Gradient coils

7. Components of MRI
Gradiant coils
• Red coil – Create a varying
magnetic field from left to right .
• Yellow coil – Create a varying
magnetic field from top to bottom.
• Blue coil – Create a varying Magnetic
field from head to toe.

8. Components of MRI
RF Coils
• RF coils are the “antenna” of the
MRI system
• They are simply a loop of wire
either circular or rectangular .
[Radiofrequency]

9. Start RF pulses ( Excitation – Protons jump to
higher energy state by absorbing radiation ).
Each proton is rotating
around its axis 63,000,000
rotation per second . The 63
MHz rotation is in the
frequency range called Radio
frequency.

10. Stop RF pulses (Relaxation – Protons return to their
original state emitting radiation)

11. Equation
The Larmor equation is given by:
Here,
• ω is how fast spins move (in radians
per second),
• γ is a constant for each atom type
(gyromagnetic ratio),
• B is the magnetic field strength.
ω =γB

12. Shape of MRI Machine
Closed MRI
Open MRI

13. Open MRI Closed MRI
Open MRI :
• High field typically 1.5 T – 3
T(Tesla)
• High Image quality
• Fast imaging
• Advance application
Closed MRI :
• Low field typically 0.2 T – 0.4 T (Tesla)
• Low image quality
• Slow imaging
• Limited application

14. Thank You