If the radiograper is unable to adjust the mAs, yet needs to double the radiographic density of a particular film, which of the following would be best to accomplsish this?
A. increase the kvp by 50%
B. Increase kvp by 15%
C. Decrease SID by 50%
D. Inrease SID by 15%
B. Increase by 15%
An exposure was made using 400 mA an. 03 sec. In order to maintain the some density, what must the new expsure time be if the ma is changed to 200?
D. 06 sec
Which of the following groups of exposures factors will produce the lowest radiographic contrast?
D. 300 mA. 03 sec 115 kVP
____________ refers to the degree of blackening of an x-ray film.
D. Density
___________ is a measurement of x-ray tube current ( the number of electrons crossing the tube from cathode to anode per second. )
Ma (Miliamperage)
When a film demosntrates long scale contrast because of over penetration, the appropriate change to restore a shorter scale of ontrast would be
D. Decrease kvp
An exposure was made using 200 mA, and 0.025 seconds. What is the mAs used fo this exposure?
A. 5 mAs
Radioraph that exhibits many shades of gray may be described as having
A. Long-scale
If 1/30 seconds was selected for a particular exposure, what mA owuld be necessary ot produce 20 mAs?
D. 600 mA
A lateral radiograph of the cervical spine as made at 40"SIDusing 500 mA ad 0/02 seconds. It is desired to use a smaller focal spot size and therefore the technoogist must use a 100 mAstation. What new time would be used to maintain radiographic density?
C. 0.1
True or False: When kvp increases, radiographic contrast decreases.
True
The relationship of mAs to distance is...
B. Radiatio nis directly propotional to the square of the distance
True or False: As distance increases, radiographic density will increase assuming no compensation is made.
False
___________refers to the differences in radiographic densities (shades of grgay)on radiograph.
D. Contrast
True or False: X-ray production occurs at the filament
False
True or False:Photons that escape the tube housing except at the port window are called off-focus raddiation.
False
True or False: The Anode side of the tube has a positive charge.
True
True or False:The faster the anode rotation the better the heat dissipation
True
True or False:Approimately 25-30% of the x-rays exiting htetue are considered off-focus
True
For which exam would it be appropriate to utilize the anode heel effect?
C. Femur
Leakage radiation must not exceed...
C. 100 mR/hr at 1 meter
What permits the electrons to flwo from cathodde toanode without encountering the gas atoms of air?
A. The precense of a vacuum
B. Dielectric oil
C.mAs ad kVP
D. Lead lined housing
A The precense of a vacuum
The anode targt surface is composed of______
A. Tungsten
Normal use of the rotating anode will evnetually vaporize sufficient target focal tract material to...
C. Roughen or pit hte target area
When utilizing the anode heel effect, ____ should be placed under the anode.
A. Thinner body part
B. Thicker body part
A. Thinner body part
The anode heel effet is most ntoiceale with..
D. Large image receptor and da short distance
The term ___________________ is used to describr the area of the focal spot that is projected out of the tube toward the obeject being radiogrraphed
B. Focal track
Which of hte following best describes the warm up procedurefor an x-ray tube.
C. Moderate kvp, moderate ma and long exposure time
Both filament and focal track are composed of..
C. Tungsten
True or False: The most diganostic target angel is between 7-17 degrees
True
Acording to the line focus principle, when the target angle is less than 45 degrees, the effective focal spot is always _______ than actual focal spot.
C. Smaller than
When the switch labeled "rotor or prep" is activated priro to an exposure, the rotor begins to turn and....