Transcript Fundamentals of Image Interpretation

Fundamentals of Image
Interpretation
Joseph Castillo B.Sc, M.Sc (MRI)
Five levels
Normal anatomy as seen on MR
 Abnormal anatomy
 Accurate and complete patient history – In
our unit this is not an option.
 Pathology – Read MRI reports
 Accurate clinical interpretation

Clinical Imaging
Three basic orthogonal planes used in MRI
– axial, sagittal and coronal
 Unlike CT, radiographers have the ability
to image biological functions not just
electron density.
 We manipulate parameters to get T1W,
T2W and PDW. The appearance of the
organ is changed.

Spine Imaging
feature
T1W
PDW
T2W
Spinal Cord intermediate intermediate Intermediate
CSF
dark
Intermediate Bright
vertebrae
intermediate
intermediate
Intermediate
disc
intermediate
Light gray
Bright
fat
bright
Light gray
intermediate
Cortex
dark
dark
dark
Spine
Spine

Which one is T2w?
A
B
?Pathology
?Pathology
?disk
Urgent MRI?
?fracture
What is this high signal?
metal
Musculoskeketal
Structure
T1W
PDW
T2W
Fat
bright
bright
intermediate
Muscle
intermediate
intermediate
Dark
Bone marrow
Intermediate/bright intermediate
Intermediate
Cortical bone
dark
dark
dark
Cartilage
bright
bright
Intermediate
Ligament/tendon
dark
dark
Dark
Fibrous tissue
dark
dark
Dark
Oedema
dark
bright
Bright
Solid organs
variable
variable
variable
Knee MRI
What is wrong with this knee?
??
Meniscus
STIR and T1W