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System Op & Compo
| Question | Answer |
|---|---|
| In order for an x-ray photon to be measured it must? a. enter the detector chamber b. be absorbed by the detector material c. be converted to a measurable event | a, b and c |
| Which system component converts the projection attenuation data into the proper digital form for the array processor? a. detector b. photodiode c. analog-to-digital converter d. host computer | c. analog-to-digital converter |
| Which of the following is NOT a function of a PACS system? a. reconstruction of the image from the raw data b. long term data storage c. digital distribution of images d. image display for the radiologists | a. reconstruction of the image from the raw data |
| Which of the following is NOT part of the CT tube? a. tungsten target b. collimator c. rotating anode d. filament | b. collimator |
| Which of the following is FALSE regarding CT systems? a. they are limited to non-oblique transverse scanning b. they cant generate a straight coronal or sagittal image c. they have no moving parts | a, b and c |
| X-rays are used in CT because a they're easily produced by the high frequency generator b they're less harmful than the heating effects of microwave rad c they penetrate the body according to specific attenuation characteristics of tissue | c |
| Most of the commands from the tech are received by: a. array processor b. operators console c. host computer d. amplifer | b |
| x-rays are produced whenever fast moving electrons collide with any form of matter because? | The electron loses kinetic energy which is converted into the emission of an x-ray photon |
| The mA determines the: a. quantity of x-ray photons b. coefficient of attenuation c. slice thickness d. energy level of the x-ray photons | a. quantity of x-ray photons |
| Which of the following is a component NOT normally located in the gantry of a modern CT system? a. pre-pt collimators b. solid-state detectors c. array processor d. x-ray tube | c. array processor |
| Tube interscan delay time refers to? | The time between the end of one scan and the start of the next scan during which the tube will cool |
| Increased ____ will increase the likelihood that a given x-ray will penetrate a material. | kV |
| Which of the following are NOT commonly used on todays commercially available CT scanners? a. xenon detectors b. 4th generation technology c. continuous rotation technology | a and b |
| Which is FALSE regarding occurrences after xray photons penetrate the detector aperture? a. the photon passes through the detector unmeasured b. the photon is converted into an electron c. the measured signal is enhanced by an amplifer | b |
| Scatter radiation is caused by? | Deflections from the original trajectory of an x-ray photon through the patient |
| What control does the operator have over the x-rays in a CT exam? | The energy level and the quantity of x-rays can be selected |
Created by:
MelissaAB
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