Introduction to CT

Computed tomography is also known as

• Computer Aided Tomography

• Computed Axial Tomography

• Computational Axial tomography

• Computational Aided Tomography

The intensity of the X-ray beam exiting the body is determined by:

• The energy of the X-ray source

• The distance between the source of X-rays and the detector

• The attenuation of the beam by materials in the object being scanned.

• All of the above

Second generation CT machine reduces scanning time

• True

• False

First generation CT consists of one X ray detectors

• True

• False

Which one of the following is not true about third generation CT?

• More than 1000 detectors

• Scan time range from 17 sec to little more than 1 min

• Xenon detector reduces ring artifacts

In the fourth generation CT machine scan time is more than 2 sec

• True

• False

which one of the following is not true about Fifth generation CT machine is

• uses electron beam

• scanning time more

• fast imaging

• applied to cardiac imaging

Gantry consists of x ray tube and detectors

• true

• false

IN CT, the current range used in X ray tube is

• 100-500mA

• 200-800 mA

• 500-600mA

• 300-700mA

Collimator removes scattered photons

• True

• false