magnetic resonance imaging (mri)
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Looking at the Interior of Human Body and Understanding its Physiology and Function:
Role of Magnetic Resonance Imaging (MRI)
Looking at the Interior of Human Body and Understanding its Physiology and Function:
Role of Magnetic Resonance Imaging (MRI)
utkARSh veRMAKVJNU
Medical Imaging Techniques
X-Ray ImagingContrast: Density, Atomic Number
X-raysource
Object
DetectorDecember 22nd, 1895
Wilhelm Roentgen
“Builder survives nailgun accident”
X ray tube
X-Ray - Digital
Comparison of CT with the Anatomy
Computerized Tomography
Pyogenic liver abscess Focal fatty degeneration of liver
Computerized Tomography
Calcaneus fracture following CT Guided surgery
Before After
MoleculeMolecule
AtomAtom
Atomic Nucleus
Atomic Nucleus
our magnetic spy !our magnetic spy !
Courtesy: Prof. Richard R Ernst
ALL INDIA INSTITUTE OF MEDICAL SCIENCESDEPARTMENT OF NMR
• High-resolution morphological
picture(anatomical structures)
• Superior soft tissue contrast
• Multi-planar imaging capability
• MR images from protons present
water and fat of human tissues
• Noninvasive – NO ionizing radiation
Magnetic Resonance Imaging
ALL INDIA INSTITUTE OF MEDICAL SCIENCESDEPARTMENT OF NMR
T1 - weighted Sagittal View
T1 - weighted Coronal View
T1 - weighted Axial View
ALL INDIA INSTITUTE OF MEDICAL SCIENCESDEPARTMENT OF NMR
Effect of T2 relaxation on Contrast in MRI
Municipal water
Mineral water
ALL INDIA INSTITUTE OF MEDICAL SCIENCESDEPARTMENT OF NMR
T1 - weighted - Axial T2 - weighted - Axial Proton Density - Axial
Tissues PD T1W T2W Fat Light Gray White Gray WM Gray Light Gray Dark Gray GM Light Gray Gray Gary CSF Gray Black White
Sella Sagittal
ALL INDIA INSTITUTE OF MEDICAL SCIENCESDEPARTMENT OF NMR
High-Resolution - Image Details
Diagnostic MR
15
Anaplastic astrocytoma Glioblastoma Mixed Glioma
ALL INDIA INSTITUTE OF MEDICAL SCIENCESDEPARTMENT OF NMR
Metastatic brain Low grade astroglia Low grade astrocytoma
MRI in the Diagnosis of Breast & Prostate Cancer
Breast -T1 - weighted
Breast - T2 - weighted ProstateT2 – weighted - Tumor
ProstateT2 – weighted – Normal
Time
Signal-Time Curves (contrast enhancement)
Functional Studies
3D dynamic CE MRI of Breast
ALL INDIA INSTITUTE OF MEDICAL SCIENCESDEPARTMENT OF NMR
Diffusion – weighted MRI
Volunteer Patient
DT
I- Diffu
sion
T
ractog
raph
y
DWIT2CTSensitivity of DWI for hyperacute stroke demonstrated in57-year old patient. Unremarkable CT and T2 MRI. DWIdemonstrates hyperintense signal in left postcentral gyrus.
ALL INDIA INSTITUTE OF MEDICAL SCIENCESDEPARTMENT OF NMR
ALL INDIA INSTITUTE OF MEDICAL SCIENCESDEPARTMENT OF NMR
Whole spine MRICervical Spine Cord compression
MR Angiography
22
ALL INDIA INSTITUTE OF MEDICAL SCIENCESDEPARTMENT OF NMR
MRI of head and cervical MRA - aortic arch to circle of Willis
MR Angiography - MRA
Monitoring Brain
Functions
24
ALL INDIA INSTITUTE OF MEDICAL SCIENCESDEPARTMENT OF NMR
Hindustan Times
31-03-2006Hindustan Times
31-03-2006
Hindustan Times
29-03-2006Hindustan Times
29-03-2006
ALL INDIA INSTITUTE OF MEDICAL SCIENCESDEPARTMENT OF NMR
Times of India
January 22nd and
24th, 2007
MRI studies brain anatomy.Functional MRI (fMRI)
studies brain function.
MRI vs. fMRI
Cerebral lateralization of function happen in a few abilities
ALL INDIA INSTITUTE OF MEDICAL SCIENCESDEPARTMENT OF NMR
Motor cortex activation Both hands
Visual cortex activation
ALL INDIA INSTITUTE OF MEDICAL SCIENCESDEPARTMENT OF NMR
fMRI during Sadand Happy moods
Activationin Amygdlaand Hippo-
campus
Liar versus Non-liar
THE TRUTH BE TOLD? [left] When the author was asked whether he had ever feigned illness to escape an obligation, his prefrontal cortex showed no unusual activity.
LIAR, LIAR? [right] When the author was asked whether he had ever padded an expense report, his prefrontal cortex became highly active [areas highlighted with hot colors].
Courtesy: Prof. Richard R Ernst
0.98 x 10-3 mm2/s
1.60 x 10-3 mm2/s
1.05 x 10-3 mm2/s
1.07 x 10-3 mm2/s
1.20 x 10-3 mm2/s
1.26 x 10-3 mm2/s
Responder Poor responder
Pre therapy
II NACT
III NACT
Diffusion MRI in Breast Cancer
ALL INDIA INSTITUTE OF MEDICAL SCIENCESDEPARTMENT OF NMR
Intra O
perative M
RI-1
Magnet positioned and preoprative images obtained
An intraoperative image performed revealing residual tumor
Magnet lowered tumor resection performed
CE images show location of the tumor
ALL INDIA INSTITUTE OF MEDICAL SCIENCESDEPARTMENT OF NMR
Intra O
perative M
RI-2
MRI demonstrates complete resection of tumor
Navigational method enables the surgeon to precisely locate the residual tumor
Surgery continues using the guidance of intraoperative navigation
MRI Scanner
Whole body MRI/A
Bilateral carotid coil
Bilateral carotid coil
Peripheral Angio coil
Matrix coil technology
Head coil
Breast array coil for biopsy
ALL INDIA INSTITUTE OF MEDICAL SCIENCESDEPARTMENT OF NMR
MRI Whole body
MRI Spine
Can’t we NOT believe this? Science or Faith???