Techniques and description of MRI and CT scans

1. HOW TO READ RADIOGRAPHS
Mariam Alosfoor

2. OBJECTIVES:-
Steps of correctly reading radiographs
Different techniques for taking radiographs
Radiological findings in the case

3. 1 2 3 4 5
HOW TO READ A RADIOGRAPH?
Follow these steps
Type of
Image
Anatomical
part
Section Technique Lesion
description

4. TYPE OF IMAGE
Magnetic Resonance Image (MRI)
•Soft tissue, Brain tumors, Spine injuries, Multiple
sclerosis, Brain step lesions
•Does not use radiation
Computed Tomography (CT scan)
•Bone injuries, Chest, Cancer detection, Brain
hemorrhage
•X-rays
Positron Emission Tomography (PET scan)
•Functional imaging
•Cancer, Epilepsy, Heard disease
•Radioactive materials
1

5. TECHNIQUE
 With / Without contrast medium
 Signal characteristics (MRI):
4
T1 T2
Black Air
Bone
Air
Bone
Dark CSF
Edema
Tissue
Brigh
t
Fat
Blood
Contrast
medium
CSF
Blood
Edema

6. LESION DESCRIPTION
Anatomy
 Exact location
 Three dimensional size
Radiological Criteria
 CT scan:
Isodense, hypodense, hyperdense.
 MRI:
Isointense, hypointense,
hyperintense.
 Edema
 Compression
 Midline shift
 Herniation
5

8. The Case

9. CT SCAN
The right sphenoidal
sinus and cavernous
sinus are filled with
tissue. There is a
destruction of osseous
structures on the
caudal and lateral side.
Destruction of the skull
base.

10. MRI
Irregular structure in
the nasopharyngeal
space with destruction
of the skull base and
ingrowth into the right
cavernous sinus and
into the
pterygopalatinoid
sinus.

11. PET SCAN

12. Any Questions?
Feel Free to Ask