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RADT425 Ch.1 & 2
| Question | Answer |
|---|---|
| How does elongation occur? | There was an angle towards the body part and the CR was not likely perpendicular to the part |
| What can we do to reduce the amount of inevitable magnification? | Increase SID |
| If the IR was placed against the medial aspect of the patient's leg and the CR was centered to the lateral aspect, what projection of the leg was taken? | Lateromedial |
| Intensity refers to the total quantity of x-ray photons that expose the patient and IR. The controlling factor for intensity and IR exposure is: | Milliampere-seconds (mAs) |
| The _____ represents the ideal histogram for the projection. | LUT |
| What type of patient condition causes the tissues to decrease mass density or thickness and become more radiolucent? | Destructive |
| What is the reasoning behind AEC early termination? | Anatomy of interest was not properly placed over the activated cells causing direct radiation to go into chamber |
| The _______ dimension of the thorax expands the most during respiration. | Vertical |
| On a properly positioned AP chest projection, ____ posterior ribs are demonstrated above the diaphragm. | 9 |
| For a Transthoracic Humerus, how long should the exposure be made? | 3-5 seconds |
| We want ____ (high/low) signal and ____ (high/low) noise. | High signal and low noise |
| A technologist / QA workstation has ________ (higher/lower) resolution than a Radiologist workstation. | lower |
| A Radiologist workstation has ________ (higher/lower) resolution than a technologist workstation. | higher |
| _____________ allows us to change the collimation field size and then reprocess the image. | Post processing |
| What statement states "It is the position of the American Society of Radiologic Technologists that a digital image should not be cropped or masked such that it eliminates areas of exposure from the image that are presented for interpretation" | ASRT position statement |
| Collimation should be within _____ of the outer tissue margins. | 0.5 inch |
| Bilateral projections generally are for what 3 body parts? | Hands, feet, knees |
| When an angled CR or diverged beam is used to record an object: | the object will move in the direction in which the beams are traveling |
| With magnification, the part ______ (closest/farthest) from the IR will be magnified the _______ (least/most) | farthest, most |
| For the most optimal spatial resolution we should use _________. | less than 300mA, longer SID, shorter OID. |
| What amount of exposure time can nearly freeze radiographic motion? | .033 seconds |
| Longer SID = _______ (increased/decreased) Spatial Resolution. | increased |
| At a 40" SID, beams diverge at about: | 2 degrees per inch |
| At a 72" SID, beams diverge at about: | 1 degree per inch |
| CR cassettes should be erased after how much time has passed? | 48 hours |
| With AEC, the technologist primarily controls what factors? | kVp and mA |
| What turns on if the AEC is malfunctioning? | AEC backup-timer |
| What is Aspect Ratio? | Relationship between the width and height of an image |
| What is the definition of Spatial Resolution? | Ability of an imaging system to differentiate between two nearby objects |
| T/F: Larger matrix sizes are better. | True |
| T/F: Smaller pixel sizes are better. | True |
| What is Pitch? | The distance from the center of one pixel to the center of the next |
| What is contrast resolution? | The ability to distinguish between differences in image intensity |
| Ambient Lighting “peripheral glare” of a monitor screen can occur depending on the viewer's: | Viewing angle |
| Veil Glare is: | Stray light that fogs images on a monitor |
| In a histogram, peaks and valleys represent: | subject contrast in remnant radiation determined by total exposure used to create the image |
| What helps maintain consistent image brightness despite overexposure or underexposure? | Automatic Rescaling |
| T/F: The histogram shape should be consistent with body part imaged. | True |
Created by:
rdwilliams
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