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ASRTOperator safety
Operator safety of fixed fluoro units
| Question | Answer |
|---|---|
| Advantages of fixed fluoroscopy systems over mobile fluoro units include : 1 Better image quality 2. smaller image intensifiers 3. reduced radiation exposure a. 1 &2 b. 1 & 3 c. 2 & 3 d. 1,2,3 | b. 1 & 3 |
| US Food and Drug Administration has compiled nearly _ documented cases of radiation-induced burns. a. 25 b. 50 c. 75 d. 100 | d 100 |
| Acute form of radiation dermatitis results from an exposure of _ Gy. a. 1-7 b. 2-8 c. 3-9 d. 4-10 | b. 2-8 |
| Which factors does the generator alter to maintain the appropriate entrance exposure at the image receptor that minimize patient entrance dose? 1. kVp 2. mA 3. pulse width a. 1 & 2 b. 2 & 3 c. 1 & 3 d. 1,2,3 | d 1, 2 ,3 |
| The _ setting determines the number of electrons emitted : the _ seting controls the penetrability of the beam a. focal spot;mA b. kV ; mA c. mA; kV d. kV; Focal spot | c. mA; kV |
| To adequately dissipate the heat of x-ray tube, _ and _ may be used. NEXT CARD | d. High speed anode rotation; grid controlled pulsed current |
| a. low-speed anode rotation; grid cont. pulsed current b. low-speed anode rotation ; circulating water heat exchanger c. high-speed anode rotation ; continuous current d. high-speed anode;grid cont. pulsed current | d. High speed anode rotation; grid controlled pulsed current |
| Spectral beam filters reduce dose by decreasing low-energy radiation. A 2.0 mm copper filter reduces the dose by _% a. 60 b. 65 c. 70 d. 75 | c. 70 |
| For fluoroscopy tables _ support pads may be acceptable, but _ pads have been reported to result in excessive attenuation. a. thin foam ; thick gel b. thick gel ; thin foam c. thick foam ; thin gel d. thin foam ; thin gel | a. thin foam ; thick gel |
| Grid ratios for floroscopy range from 6:1 to 10:1 , lower than the radiographic range of 8:1 to 16:1 1. True 2. False | TRUE |
| Which part of the image intensifier converts x-rays to electron? a. electron lense b. input layer c. output layer d. anode | b. input layer |
| 3 to 5 magnification modes usually are availabe on most image intensifiers, the dose typically _ with greater magnification a. increase b. decrease c. remains the same d. decreases exponentially | a. increase |
| The acquisition or cine mode should be used sparingly because about _ times more radiation per frame is needed to obtain diagnostic quality images than the fluoroscopy mode. a. 5 b. 10 c. 15. d. 20 | c. 15 |
| Image processing techniques available with digital fluoroscopy to enhance image quality include 1. Lat image hold 2. gray-scale processing 3. temporal fram averaging a. 1 & 2 b. 1 & 3 c. 2 & 3 d. 1,2,3 | d 1, 2, 3 |
| The most common R/F system configuration contains a a. under table x ray tube b. overtable x ray tube c. ceiling mounted c arm d. floor mounted c arm | a. undertable x ray tube |
| For cardiac catheterization, the ceiling mounted carm should be positioned with the _located on the patients right and the _ on the patients left to minimize magnification of the heart a.tv monitor;II b. tv monitor;xray tube c.xray tube;II d.II;xray tube | c x ray tube ; II |
| grid removal may reduce patient dose by a factor of _ or more a. 2 b. 3. c. 4 d. 5. | a. 2 |
| Some fluoro units contain in-pulse control technology that adjusts exposure settings in real time. The operator selects parameters such as _ & _ before fluor exposure takes place and the in pulse control alters the beams penetration NEXT CARD | a. patients size ; exam type |
| a.patient size; exam type b. patient size ; patient age c. patient age ; exam type d. exam type ; exam date | a. patients size ; exam type |
| During fluoro, the image intensifier should be as close to the patient as possible to: 1. reduce patient dose 2. improve image quality 3. increase magnification a. 1&2 b 1&3 c. 2&3 d. 1,2,3, | a. 1 & 2 |
| For preagnant personnel, the monthly equivalent dose to the embryo or fetus should not exceed _ per month and _ over the course of the pregnancy a. .5mSv ; 5 mSv b. .5rad ; 5 rad c. .5 rem ; 5 rem d. .5 Gy ; 5 Gy | a .5mSv ; 5 mSv |
| If there is any possibility that a patient is pregnant, abdominal or pelvic examinations should be conducted within _ days of the patients last menstrual period a. 8 b. 18 c. 28 d. 38 | c. 28 |
| When imaging stomach and small intestine, the exposure time should be no longer than _ seconds for patients with normal peristalic activity & _seconds or less if the patient has hermotility a. .5;.4 b..4;.3 c..3;.2 d. .2;.1 | d. .2 ; .1 |
| According to the ACR practice guidelines, the basic requirements for _ procedures include high quality fluoro imaging equipment, film or digital records of the examination, a tilt table that is capable of inclining the head -30 downward and a proper CONT | b myelography |
| support device for securing the patient on the tilt table a. gastrointestinal b. myelography c. cardiac catheterization d. percutaneous needle biopsy | b myelography |
| Which of the following steps usually occurs first in digital subtraction angiography a. subtracting the mask image from the contrast image b. acquiring the mask image c. demonstrating the vessels of interest d. injecting a contrast medium | b. acquiring the mask image |
| Which of the following structures is most vulnerable to radiation damage during cerebral angiography a. ear b. eye c. larynx d. parotid | b eye |
| To reduce motion blur, the pulse width should be no greater than _ milliseconds in infants and children a. 2-3 b. 3-4 c 4-5 d. 5-6 | c 4-5 |
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