Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Review Class #2
Image Production and Tech Evaluation
| Question | Answer |
|---|---|
| An algorithm is | a series of variable instructions |
| An increase in kVp effects remnant beam by | increased scatter and increased exposure rate |
| factors that impact image spatial resolution | patient factors, focal spot size and SID (etc) |
| _____ is directly related to photon energy | kilovoltage |
| Units used to express resolution include | line-spread function and line pairs per millimeter |
| What system requires the radiographer to select the anatomic part from the console menu | APR |
| x-ray photon energy is inversely related to | photon wavelength |
| a decrease in kVp results in | decrease in photon energy and decrease in receptor exposure |
| Exposure factors of 400 mA, 70 ms and 78 kV were used to produce a particular image receptor exposure, A similar image can be produced using 500 mA, 90 kV and _______ms | 28 |
| An exposure was made at 36 in SID using 300 mA, 3ms exposure and 80 kV and an 8:1 grid. Its desired to repeat the image using a 40 in SID and 70 kV. With all other factors constant whats the new required exposure time? | 0.07s |
| Which has the greatest effect on radiographic IR exposure? 1. aluminum filtration 2. kilovoltage 3. SID 4. scattered radiation | 3. SID |
| Images for medicolegal reasons must contain | the patients name and identification number and a left or right side marker |
| the distance between the center of one pixel and the center of the adjacent pixel is | pixel pitch |
| which two are associated w the term "voxel"? 1. bit depth 2. volume element 3. measure in Z direction 4. field of view | 2 and 3 |
| If you have a 48 in SID how much OID is required to magnify an object 2 times? | 24 in OID |
| A radiograph was produced using 12 mAs and 85 kVp with a 16:1 grid. The radiograph is repeated using an 8:1 grid. What should be the new mAs value? | 8 mAs |
| analog-to-digital conversion is required in what image system? | CR |
| the PSP plates used in CR are constructed in layers that include | light shield layer, support layer and electroconductive layer |
| ________ and _________ are methods to limit scatter radiation | usiing the prone position for abdomen exams and restricting the field size to the smallest practical size |
| types of shape distortion include | elongation and foreshortening |
| In what way does SID affect sharpness of image detail | direct relation |
| _______ is not related to IR exposure | brightness |
| In digital imaging, kVp selection has an effect on | photon energy and penetration |
| the QA term used to describe consistency in exposure at adjacent mA stations is | linearity |
| factors that impact spatial resolution | focal spot size, subject motion and SOD |
| A grid is used when | radiographing a large or dense body and when using a high kVp |
| image plate front material can be made of | carbon fiber and magnesium |
| what pixel size has a 512x512 matrix with a 20 cm FOV | 0.40mm/pixel |
| kVp and wavelength are _______ proportional | indirectly |
| factors that impact spatial resolution in CR digital imaging include | pixel pitch and sampling frequency |
| double exposure and motion are considered | exposure artifacts |
| increase in the kVp applied to the x-ray tube increases ______ | exposure rate |
| the expoure factors used for a particular nongrid xray image were 300 mA, 4ms and 90 kVp. Another image using and 8:1 grid is requested. what group of factors is mot approporiate | 400 mA, 12 ms ad 90 kV |
| if a 6 in OID is introduced during an exposure what change in SID is necessary to overcome magnification? | SID increased by 42 in |
| causes of grid cutoff when using a reciprocating grid include | inadequate SID |
| what are the effect of scatter radiation on a radiographic image | impairs visibility of detail |
| _____, ______ and ______ all can be used to measure geometric blur | star pattern, slit camera and pinhole camera |
| digital processing functions include | rescaling and histogram analysis |
| in digital imaging mAs effects | receptor exposure and patient dose |
| what two factors effect both quality and quantity of the primary beam? | HVL and kV |
| _______ is not related to spatial resolution | milliamperage |
| the purpose pf the electroconductive layer of the CR-PSP plate is | to facilitate transportation through the scanner/reader |
| what pixel size has a 2048x2048 matrix with a 60 cm FOV? | 0.3 mm |
| as window width increases, contrast scale ________ | increases |
| ionizing radiation intensity increases as distance from the source of radiation __________ | increases |
| spatial resolution is ________ related to OID and part motion. | inversely |
| the xray image seen on the computer display monitor is an | analog image |
| As DEL size decreases spatial resolution _______ | increases |
| functions of automatic beam limitation devices include | reducing the production of scattered radiation |
| the maximum spatial resolution in digital imaging is equal to | Nyquist frequency, which iss 1/2 x the pixel pitch (mm) |
| the processing algorithm represents | the anatomical part and projection |
| _______ is a term used to describe anything that interferes with visualization of the xray image. | Noise |
Created by:
enclapacs