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2nd stack
Image Acquisition and Evaluation
| Question | Answer |
|---|---|
| Misalignment of the tube-part-IR relationship results in ? | Shape distortioning |
| An algorithm is a? | series of variable instructions |
| The intensity of ionizing radiation decreases as.... | distance from the source of radiation increases |
| The reduction in xray photon intensity as the photon passes through material is termed? | attenuation |
| If a lateral projection of the chest is bearing performed on an asthenic patient and the outer photocells are selected, what is likely to be the outcome? | decreased IR exposure |
| The component of a CR image plate that records the radiologic image is the? | photostimulable phosphor |
| The radiation dose received by the digital detector for each image is indicated by the? | exposure Indicator |
| The luminescent light emitted by the PSP is transformed into the image seen on the CRT by the ? | ADC |
| The term windowing describes the practice of? | changing the image brightness and/or contrast scale |
| Foreshortening can be caused by ? | the radiographic object being placed at an angle to the IR |
| Unopened boxes of radiographic film should be stored away from radiation and ? | in a vertical position |
| term used to describe unsharp edges of tiny radiographic details | Blur |
| The term pixel is associated with all of the following except... | how much of the part is included in the matrix |
| Geometric blur can be evaluated using all the following devices except? | penetrometer |
| Because of the anode heel effect, the intensity of the xray beam is greatest along the... | cathode end of the beam |
| the term voxel is associated with all of the following except | FOV |
| Analog to digital conversion is required in the following imaging system | CR |
| For the same FOV, spatial resolution will be improved using.. | larger matrix |
| The absorption of useful radiation by a grid is called... | grid cutoff |
| All of the following are related to spatial resolution except? | milliamperage |
| Focal spot blur is greatest... | toward the cathode end of the xray beam |
| How are mAs and patient dose related | directly proportional |
| Which of the following pathological conditions requires a decrease in exposure factors? | Emphysema |
| Which of the following conditions would require decrease in exposure factors? | Osteoporosis |
| Diagnostic xrays are associated with... | high frequency, short wavelength |
| Which of the following devices is used to overcome severe variation in patient anatomy or tissue density, providing more uniform receptor exposure? | compensating filter |
| Underexposed of an SF radiograph can be caused by all the following except insufficient | SID |
| The process of windowing of digital images determines the image... | contrast |
| What is the purpose of the thin layer of lead that is often located on the rear portion of an IP? | to prevent scattered radiation fog |
| The purpose of the electroconductive layer of a CR PSP plate is to... | facilitate transportation through the scanner/ reader |
| Which of the following combinations is most likely to be associated with quantum mottle? | decreased mAs, increased kV |
| As window level increases... | brightness increases |
| The radiographic accessory used to measure the thickness of body parts in order to determine optimal selection of exposure factors is the ... | caliper |
| The xray image seen on the computer display monitor is a... | analog image |
| A radiograph made with a parallel grid demonstrates decreased receptor exposure on its lateral edges. This is due to... | decreased SID |
| A particular mAs value, regardless of the combination of milliamperes and time, will reproduce the same receptor exposure. This is a statement of the... | reciprocity law |
| OID is related to spatial resolution in which of the following ways? | Spatial resolution is inversely related to OID |
| In digital imaging, as DEL size decreases | spatial resolution increases |
| An increase in kV will serve to | increase photon energy |
| What requires 2 exposures to evaluate focal spot accuracy? | Slit camera |
| Focusing distance is associated with... | grids |
| the processing algorithm represents the | anatomical part and projection |
| 43 The relationship between height of a grid's lead strips and the distance between them is reffered to as grid.... | ratio |
| Changes in mAs can affect all of the following except... | spatial resolution |
| What feature is used to display RIS info on current patients? | modality work list |
| Why is a very short exposure time essential in chest radiography? | to minimize involuntary motion |
| How is SID related to exposure rate and image receptor exposure? | As SID increases, exposure rate decreases and receptor exposure decreases. |
| In digital imaging, TFT DEL size is related to | spatial resolution |
| Which pathological condition requires an increase in exposure factors | Ascites |
| One pair line is described as | one blank line on a light background and an interspace of the same width |
Created by:
nasanders