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
Mammography2
Instrumentation and Quality Assurance
| Question | Answer |
|---|---|
| In mammography, selecting extremely low kVp values | increases contrast but increases patient dose |
| What target-filtration combination provides the best penetration for dense or thick breast? | rhodium target with rhodium filtration |
| The material used for the exit port of the mammography tube is necessary because | Regular glass would harden the emerging beam. |
| The intensity of the x-ray beam from the cathode side of the tube is generally higher because | The heel effect causes variation in the intensity of the x-ray beam. |
| The design of the lip of the compression paddle (both height and angle along the chest wall) affects all of the following | -prevents the posterior and axillary fat from overlapping the body of the breast -allows uniform compression of the posterior breast tissue -helps to increase structural strength of the compression paddle |
| The primary goal of compression is to | allow uniform penetration of structures within the breast. |
| AEC failure, resulting in an underexposed radiograph, can be caused by | improper placement of the dense breast tissue/size over the detector |
| Most AEC circuitry in modern mammographic imaging has at least three detectors. Three or more detectors are recommended because | Multiple detectors allow for maximum variations in breast size and tissue density. |
| The major difference between the general radiography grid and the grid used in mammography is that the | grids used in general radiography have higher ratios |
| As the size of the x-ray field decreases, to maintain a constant image density the exposure will | increase |
| The chest wall edge of the compression paddle should be aligned just beyond the chest wall edge of the IR to | avoid projecting the chest wall edge of the paddle on the mammogram. |
| Which of the following affects focal spot size? | angle of the anode |
| In mammography, the commonly used focal spot size for routine work is | 0.3 mm |
| Which of the following characteristics are unique to mammography cassettes? | generally have a single intensifying screen. |
| Two main disadvantages of extended processing are | increased processing artifact and increased film fog |
| In digital mammography, both the film and cassette can be replaced by | a detector and electronic system |
| The greatest difference between digital technology and conventional mammography imaging is | In digital technology, the final image can be manipulated |
| All of the following are characteristics of double emulsion film/screens combination. Which characteristic makes these systems undesirable in mammography use? | The system has a lower spatial resolution than the single emulsion systems. |
| Film fog is best demonstrated on the characteristic curve as | the toe of the graph |
| The characteristic curve, obtained by plotting density values from a sensitometer, can be used to assess all of the following exvept: | to compare the x-ray beam quality with different films |
| The characteristic curve of two films is plotted.The curve of film A is positioned to the left of the curve of film B. | -film A is faster than film B -at any optical density, film A will require less exposure than film B |
| Which of the following mammographic quality control tests is performed monthly? | visual checklist |
| Adequate "air bleed time" refers to the | elapsed time between film loading and exposure |
| Which of the following quality control tests does not require a densitometer? | screen cleanliness |
| The criteria to pass the ACR Mammography Accreditation on conventional phantom imaging require a minimum of ___ masses. | three |
| In establishing processing quality control operating levels, the speed index is designated as the density | closest to but not less than 1.20 |
| For the daily quality control testing, the base-plus-fog level should remain within | +0.03 of the established levels |
| The screen-cleaning test should be carried out whenever | a mammographer notices dust artifacts on the image |
| Before processing the sensitometric strip each day, the mammographer should | check the developer temperature |
| The phantom image background optical density should never be | less than 1.20 |
| In the darkroom fog test, the optical density difference between fogged and unfogged areas of the film should not exceed | 0.05 |
| In viewing phantom image, which of the following viewing conditions need not apply? | using the same film emulsion batch |
| In the test for screen contact there were multiple points of small areas (<1 cm in diameter) of poor contact. The corrective action is to | return the cassette to clinical use |
| One of the two reasons towels are used in the compression test is to | protect the cassette holder |
| For the repeat analysis to be meaningful, a patient volume of at least ___ patients is needed. | 250 |
| Daily processing control can involve all of the following except | using the sensitometer to measure the densities on the strip |
| Proving that a darkroom fog failure is a result of safelight problems involves | repeating the test with the safelights off |
| The darkroom fog test is performed | semiannually |
| Daily processor control is used to | -determine the film speed -check the film contrast -check the stability of the processor |
| If, after examining a phantom image, the number of visualized fibers of masses has changed significantly, the next step is to | check the mammography unit or the image processor |
| Repeated films are | films that involve exposure to the patient |
| If the patient volume at a mammography site is 200 patients per week, the repeat/reject analysis should be done every | 3 months |
| All the fluorescent tubes in the mammography view box should be replaced at the same time because | Fluorescent tubes decrease in brightness with age |
| In imaging the phantom, the technical factors used should be the same as those used clinically for a __-cm-thick breast of medium glandularity. | 4.0-4.5 |
| Mammography facilities can receive certification from | -the FDA -an SAC state |
| An MQSA certificate is issued when a mammography facility has been accredited. This certification is valued for | 3 years |
| If any of the visual checks fail, the first step is to | correct or replace the item |
| Digital images can be viewed on a computer monitor or printed using | dry laser technology |
| Hardcopy viewing of the digital imaging describes | the image that is sent for interpretation |
| The grid ratio can vary in modern mammography units. A common grid ratio used is | 4:1 |
Created by:
Raiderette209
Popular Radiology sets