poaterior to the bladder, anterior to the rectum, superior to the prostate gland.
Non Ionic Conatrast
Iopamidol------------Iohexol
Ionic Contrast
Diatrizoate----Metrizoate--- Ioxaglate
What causes a streak artifact generally found between the fundus and body of stomach?
Air-Contrast interface or edge gradient
What artifact is commonly found between the petrous ridge and brain tissue and is cuased by x-ray penetrating bone and traveling over soft tissue?
Beam Hardening or cupping
What is partial volume averaging?
Two oe more tissue types types contained in one pixel can give ROI reading of (average) pixel values (wrong ct Nnumber)
Why is important to scan the supraclavicular region through the adrenal glands for CT of the chest?
Lung mets spread to adrenals and vice-versa
What is the disadvantage of spiral scanning?
blooming of the effective slice thickness (ie thicker slices than the operator selected 10mm actually 12.5mm) Increased Partial volume averaging, Icreased Image noise do interpolation algorithems involved in the reconstruction process.
pitch
table movement/slice thickness
Why is intravenous contrast used for spine CT?
differentiate between scar tissue and herniated pulpous material.
