MAGNETIC RESONANCE IMAGING

(MRI)

Done By :Ajay Nagisetti

MAGNETIC RESONANCE IMAGING[MRI]

MRI is nothing but magnetic resonance imaging .

MRI is first introduced by RAYMOND VAHAN DAMANDIAN ,in the year 1977.

Unit of MRI is ‘tesla’’.

COMPONENTS OF MRI Magnet Power supply Computer system Documentation system Cooling system Monitoring camera Magnet room should be shielded with

faradays cage.

ABOUT MRI MACHINEThe machines are large tube shaped

magnets ,when you lie inside an MRI machine the magnetic field temporarily railings hydrogen atom in your body.

MRI has no radiation .The scan time of MRI takes approximately

(30-40)mints.In MRI we can identify tissues and

abnormalities .In MRI we can do Angiogram with out

contrast.

PROCESS OF SCAN• When a patient is placed in the strong

magnetic field in MRI SCANNER, The hydrogen nucleus in the body, align with the applied external magnetic field when exposed to short brush of electromagnetic energy in the form of radiofrequency(RF) PULSE.

• The hydrogen nuclei in the patients body absorb its energy and then generate MR signal. This absorbing energy is known as “magnetic resonance .”

PRECAUTION OF RADIOLOGY DEPARTMENTIN Radiology department X-ray,

CT,Mammography, OPG— has radiation .MRI & ULTRASOUND has no radiation.IN MRI Metals, mobiles, watch,etc… are not

allowed.LEAD Aprons must wear in radiation rooms

like x-Ray, CT, etc…..Technician must use TLD Badge in

radiation room.Pregnant ladies should not allow in to the

radiation room but can enter into the MRI.

NOVEMBER-7th IS THE

INTERNATIONAL DAY OF

RADIOLOGY