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Parker test ch 7
parker test chapter 7
| Question | Answer |
|---|---|
| failuare of the reader to find the collimation edges of an image | may cause the image to be too bright or too dark |
| if the entire range of exposure were digitized, pixel values represennting ___would be digitized | all values |
| data collected within the collimator are represneted by a | historam |
| a histogram displays the useful signal by locating | maximum and minimum signal |
| the highter the kilovoltage peak, the | narrower the histogram |
| the sahpe of the histogram is anatomy specific | true |
| they nyquist theorem states that the | sampling frequency must be twice the input signal bandwidth |
| if too few pixels are sampled, the result will be | low resolution |
| raw dta used to form the image histogram are compared with | a normal histogram referenced by the computer |
| loss of detail in a digitally processed image | occurs because of the number of conversions |
| the longer an image is stored in the cr cassette, the | more energy is lost by the electrons |
| a wraparound image or image aliasing occurs when | sampling occurs less than twice per cycle |
| image aliasing is similar to the moire effect caused by grid error | true |
| in an effort to display the pixels for the area of interest when exposure is greater or less than what is needed to produce an image, _________occurs. | automatic rescaling |
| automatic rescaling means that images are produced, regardless of the amount of exposure, with _______. | uniform contrast and density |
| automatic rescaling can be substituted for appropriate technical factors. | false |
| a look-up talbe is not used as a reference to ________ | set appropriate kilovoltage peak and miliampere-seconds values |
| changing the slope of the hook-up table graph will increase or decrease | contrast |
| the amount of error that can be amde and still resultin the capture of a quality image refers to | latitude |
| exposure latitude for digital imaging is less than that of film/screen imaging | false |
| the kodak process that allows increased latitude while preserving detail is known as | EVP |
| the sum of the components in a recording system cannot be greater than the system as a whole is a definition of | modulation transfer function |
| a perfect image processing system would have an MTF of | 1 or 100% |
| it is possible to achieve an MTF of 100%. | true |
| the more light spread, the _______the MTF. | lower |
Created by:
sunhwa