what is the parameter of ct-scan?

Answer 1

Computed tomography (also known as CT, CT scan, CAT, or computerized axial tomography) scans use x rays to produce precise cross-sectional images of anatomical structures.

CT scan allow the construction of detailed images and offer another, and in many cases, more affordable means of diagnosis without invasive surgical procedures. CT scans can also be used to guide the course of surgical procedures.

CT scans often utilize a medium or contrast enhancer, provided in the form of a drinkable liquid or via injection into the patient's bloodstream. Approximately 45 minutes before a patient is examined, the individual is given an intravenous injection of a radiopharmaceutical tracer. A brain scan and scan of the spinal cord can take less than 30 minutes.

Radiation exposure from a CT exam is roughly equal to a normal year's worth of exposure to natural background radiation—more than from a conventional x-ray examination, but less than that of other x-ray exams such as a skull x ray.

Because x rays are high energy rays that can damage critical cells in the developing embryo, women who suspect that they are pregnant should inform their doctor and the CT scan technologist prior to the exam. Nursing mothers are often advised to wait 24 hours after the injection of the contrast medium before resuming breast-feeding.

Because CT scans provide only axial cross-sections, an MRI test is often used to more carefully examine unusual or suspect findings.-

Answer 2

Jay is close but not totally correct. Ct is only acquired axially but with volume/multislice imaging multiplanar reconstructions are easy to do.
A radiopharmacutical is not given for a CT- - Nuc Med only. Also the injection is given at the time of the scan not 45 min before.

He was pretty close on everything else.

Answer 3

Paramaters ... plural.

Lots of parameters: body site (upper and lower bounds of the scanned volume), radiation dose, angle of the scanner, spiral CT or separate slices ...

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