CT scan section 1

2. CT=CAT (Computer Axial Tomography Scan)

13. Indications of CT :-
Diagnose muscle and bone disorders, such as bone tumors
and fractures.
Pinpoint the location of a tumor, infection or blood clot. Guide
procedures such as surgery, biopsy and radiation therapy
CT is a good examination in a variety of conditions
including:
•acute head injury;
•suspected subarachnoid hemorrhage ;
•ureteric calculus;
•acute cervical spine trauma where there is a higher-than-
average likelihood of fracture or dislocation;
•suspected acute appendicitis in a non-pregnant patient.

14. agents during computed tomography include
 a history of reactions to contrast agents.
 pregnancy.
 radioactive iodine treatment for thyroid disease
 metformin use.
 and chronic or acutely worsening renal disease
Contraindications of CT :-

15. CT scans may be done with or without "contrast.“
Contrast refers to a substance taken by mouth or injected into an
intravenous (IV) line that causes the particular organ or tissue
under study to be seen more clearly.
Contrast examinations may require you to fast for a certain period of
time before the procedure
e.g., iodinated contrast agents (IV) , barium-sulfate compounds
(Oral) .
Contrast Media :

16. Densities on CT images (HU ) :