What is mean by helical scan?

Question:

it is the process used in ct scan machine

Answers:
I believe you just answered your own question, 2pts for you!

"CT (computed tomography) has been revolutionized by the advent of volumetric (spiral, helical) CT. In contrast to conventional CT which images a slice of the body, incrementally moves the patient, obtains another slice, and so forth, helical CT acquires data continuously as the patient travels through the CT gantry. This approach markedly decreases the time required to do a study. The entire chest, abdomen and pelvis are scanned in seconds. It’s other advantages are elimination of motion artifact, imaging during the window of optimal contrast enhancement for maximal image contrast, and the capability of presenting and interpreting images in any plane (multiplanar reformatting)."

http://parkviewimaging.com/helical_ct.ht.

"If you are lucky enough to find a facility that has a spiral or helical scanner, you will spend less time lying on your back for a CAT scan. Spiral / helical scans are newer scanners that are faster and more accurate."

http://lungdiseases.about.com/od/commont.

What is mean by helical scan?

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