An image that demonstrates low contrast can be caused from:
1. High mAs
2. Low kVp
3. Insufficient beam restriction - ANSWER-C. 3 only
Which
... [Show More] of the following interactions with matter reduce contrast in an x-ray image? - ANSWER-Compton scattering
From anatomical position, pronating the hand will result in the palm facing ____.
posteriorly - ANSWER-posteriorly
A decrease in IRS will produce a _____ in receptor exposure. - ANSWER-decrease
The portion of the image intensifier device that is responsible for converting light photons into free electrons is the: - ANSWER-The Photocathode
With increasing levels of beam filtration where will the greatest dose savings be realized? - ANSWER-in the initial layers of tissue struck by the beam
Why is limiting the maximum kilovoltage of the useful X-ray beam important when performing exams employing an iodinated contrast media? - ANSWER-excessive kilovoltage reduces the ability of the iodinated contrast media to attenuate the useful X-ray beam
The following factors below will yield a beam intensity of 1200 photons/unit area at a source to image receptor distance of 80": 70 kVp, 150 mA, 1/5 seconds, 2.0 mm focal spot. What will be the resultant beam intensity if the same factors were to be used at a 40" source to image receptor distance? - ANSWER-C. 4800 photons/unit area
Which of the following carpal bones of the wrist is the largest? - ANSWER-Capitate
To aid in decreasing the amount of superimposition of the right ureter over the transverse processes of the lumbar vertebra, which of the following positions is recommended? - ANSWER-right posterior oblique
What feature below is an essential component of modern fixed radiographic equipment, designed to minimize unnecessary radiation exposure to patients? - ANSWER-PBL
As the angle of the face of the anode increases from 5 degrees to 15 degrees, spatial resolution will: - ANSWER-decrease
The positioning landmark located at the base of the nasal spine - ANSWER-acanthion
Where in the X-ray circuit can the mA selector be found? - ANSWER-the filament circuit
What is the correct degree of tube angulation with the patient adjusted with the infraorbitomeatal line perpendicular to the table for an AP axial (Towne) position of the cranium? - ANSWER-37 degrees caudad
Administrative and computerized clinical data such as patient demographics, medical reports, insurance claims and physician orders are overseen using which of the following standards? - ANSWER-HL-7
Which flexure of the colon is demonstrated best in the right posterior oblique position during a lower gastrointestinal tract contrast media exam? - ANSWER-splenic
The violet light emitted by the PSP is transformed into the image seen on the CRT by which of the following: - ANSWER-analog to digital converter
- ANSWER-
A comparison of photon energies would demonstrate that scattered photons resulting from a "Compton" interaction are ____ the energy of the incident X-ray photon. - ANSWER-lower than
A decrease in SID will create: - ANSWER-size distortion
Which of the following occurs with interphase death? - ANSWER-the cell dies before leaving interphase
Which law listed below states "a direct relationship is necessary to compensate for the changes in intensity and receptor exposure? - ANSWER-direct square law
Sterility of male patients due to excessive radiation exposure to the gonads is an example of what type of radiation effect? - ANSWER-local somatic
The primary side of a high-voltage transformer is supplied by 240 V and has 150 turns, and the secondary side has 25,000 turns. What is the voltage that will be induced into the secondary side of the transformer? - ANSWER-40 kV
What is the term applied to radiation injuries that are limited to an exposed individual and the area of exposure only? - ANSWER-local somatic injuries
A PA skull projection image with the structures of the petrous pyramids completely filling the boney orbits, is an indication that the image was produced with: - ANSWER-the orbitomeatal line and central ray perpendicular to the image
Where should cleaning of your radiographic equipment immediately following a portable chest radiograph on an isolation patient take place? - ANSWER-in the corridor outside the patient's room
What is the primary function of setting a back-up time when making an exposure with an automatic exposure control or photo timed unit? - ANSWER-patient safety device in case of equipment malfunction
What test is performed to determine if you are experiencing rectifier failure of a single phase full wave rectified X-ray unit? - ANSWER-spinning top test
A patient is being scheduled for a series of radiographic examinations. Select the most preferred sequence of exams listed below: - ANSWER-KUB, IVU, BE, UGI
Which of the following is best demonstrated on a lateral projection of the elbow? - ANSWER-olecranon and olecranon process
Absorbed x-ray energy is converted into visible light using which of the following: - ANSWER-indirect capture DR
What is the maximum exposure rate at the surface of the table top for a conventional fluoroscopic unit? - ANSWER-10 R/minute
Which of the following would reduce receptor exposure by one-half if it was not possible for the technologist to adjust the mAs? - ANSWER-make a 15% decrease in kV
What component of circuitry is considered the "source of origin" for the production of kVp? - ANSWER-autotransformer
In digital imaging spatial resolution improves with which of the following:
1. smaller pixel size
2. larger image matrix
3. smaller pixel pitch
4. smaller image matrix - ANSWER-1, 2, and 3 only
When 350 volts are supplied to a transformer constructed with 47,500 primary and 142,500 secondary turns, what will be the amount of voltage exiting the transformer? - ANSWER-1,050 volts
Which of the following positions will best demonstrate a hiatal hernia while performing an UGI series? - ANSWER-Trendelenburg
Grid devices will have no effect on which of the following items? - ANSWER-production of secondary and scattered radiation
What is the difference between X-radiation and gamma radiation? - ANSWER-source of origin
What type of motor is required to rotate the anode within a rotating anode X-ray tube? - ANSWER-induction motor
During a fluoroscopic exam that takes seven minutes to complete the exposure rate to the operator is calculated to be 15mR/minute at a distance of three feet from the side of the table. What will be the technologist's total exposure for this exam if he/she stands at a distance of five feet from the table? - ANSWER-5.4 MR
Which of the following emissions released during radioactive decay, produces the greatest amount of radiolysis per mm of irradiated material? - ANSWER-alpha emission
What is the proper treatment of a patient who is experiencing a contrast media extravasation into tissues around a vein:
1. apply pressure to the site of injection
2. moist heat should be applied to the affected area
3. a cold pack should be applied to the affected area - ANSWER-1 and 2 only
What position below is successful in placing the negative contrast agent used during a double contrast upper gastrointestinal tract exam in the fundus of the stomach? - ANSWER-right anterior oblique
Which position below will best demonstrate the articular facets on the left side of the cervical spine? - ANSWER-left lateral
An exposure monitor, when placed at a distance of three meters from the fluoroscopic table, yields a reading of 700 mR for an examination that takes fifteen minutes to complete. If all exposure factors remain constant, what would be the total exposure to a technologist standing at a distance of two and a half meters from the fluoroscopic table? - ANSWER-1008 mR
What position below is done to demonstrate a profile view of the left kidney? - ANSWER-
What effect does an increase in image receptor speed have on spatial resolution? - ANSWER-decrease
Which of the following is the legal document that names the person who is authorized to make all health care decisions when a patient is unable to do so? [Show Less]