Dr'P'Rajan MD DMRD DNB

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MRI

• Dr.P.Rajan MD DMRD DNB
• Assistant Professor
  
• Department of Radiodiagnosis
  Medical College Calicut

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What is it?

• A powerful diagnostic imaging tool
• Safe------no radiation
• Highly accurate ----95-100 percent
• Realistic images-----as close to human anatomy
  --------only competitor is the surgical blade

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Magnetic resonance imaging

• Body kept inside a powerful magnet 1-1.5 T
• Protons align in the direction of the field
• Radiofrequency pulse is applied and removed
• Protons absorb that energy and transmit back
• Protons vary in this aspect----sumo wrestler vs
  pygmy
• Transmitted energy picked up by coils
• Computer processes and shows image

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How can I utilise this powerful tool

• Commonest illnesses---headache
• Backache
• joint pain

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• Not as common but deadly---cancers
• Gall stones
• Aneurysms
• Cause of epilepsy
• Multiple sclerosis,alzheimers disease

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Advantages

• Ultrasound accuracy non invasive but less
  accurate in tumor diagnosis
• CT scan radiation dose 100 times
• Painless and non-invasive MRI
• Anatomy and function

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Disadvantages

• Metallic implants
• Pacemakers
• Claustrophobia
• High cost

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T1 ,T2 ??weighting

• Relaxation time
• Time to echo
• CSFblack or white

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Advanced applications

• MRA
• Kinematic CT
• Functional MRI
• MRCP

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The future

• Functional MRI
• Intraoperative MRI
• Neuronavigation
• Open mri

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Thank You