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image prod 3 50

Terms in this set (50)

The cathode is made of filament wires made of ___________ and a focusing cup made of ____________.
tungsten; molydenum
A radiograph is performed using 40 mAs, 80 kVp with a 100 cm SID receptor distance, a 40 cm object-to-image receptor distance, and a 2 mm focal spot. The magnification factor for this image is approximately?
1.66
Ascites is a condition that will most likely require the kVp to _________ and the mAs to _______.
increase; increase
To have an acceptable digital image thought to be of diagnostic quality, the spatial resolution must be at least _____.
2.5 lp/mm
A technique of 300 mA, 100 ms and 75 kVp is employed to produce an image with appropriate quality. Using the 15% rule, fill in the values below that will maintain a similar quality radiograph. 300 mA ____time 86 kVp
0.05 sec
State the new exposure that would be received by a radiographer if the original SSD was 40 inches at 100 mSv/week if the new SSD 80 inches.
25 mSv/week
If the lead strips are 3 mm high and are separated by an interspace of 0.25 mm, what is the grid ratio?
12:1
A satisfactory abdomen radiograph is produced using 5 mAs at 80 kVp without a grid. A second image is requested using a 12:1 grid. What mAs is needed to produce a second satisfactory image?
25 mAs
A satisfactory radiograph is made at a 200 cm SID receptor distance using 25 mAs at 75 kVp. What new factors will produce a similar radiograph if a 400 cm SID is used
100 mAs
While using an AEC lowering the mA will result in (a) ___________in exposure time
increase
If the time it takes to deliver 300 cGy is 3 minutes at 200 cm SSD, what dose would be received in 5 minutes at a 100 cm SSD.
2000 cGy
A technique of 300 mA, 100 ms and 75 kVp is employed to produce an image with appropriate quality. Using the 15% rule, fill in the values below that will maintain a similar quality radiograph. 600 mA ____time 64 kVp
.1 sec
Which of the following will produce the smallest effective focal spot?
10 degree anode angle
Flux gain X minification gain =_________.
brightness gain
A satisfactory abdomen radiograph is produced using 10 mAs at 85 kVp without a grid. A second image is requested using a 5:1 grid. What mAs is needed to produce a second satisfactory image?
20 mAs
A satisfactory chest radiograph is produced using 5:1 grid, 20 mAs at 80 kVp. A second image is requested using a 12:1 grid. What mAs is needed to produce a second satisfactory image?
50 mAs
Which of the following operates the rotor that spins the anode during a radiographic exposure?
induction motor
Which of the following contribute to an image with quantum noise? A. low mAs B. high kVp C. fast image receptor D. high mAs
A, B, & C
The _________ selectors controls the autotransformer.
kVp
Which of the following will give the same mAs as a 400 mA, .2 second exposure? A. 1000mA X 800ms B. 500mA X 50ms C. 200mA X 200ms D. 100mA X 800ms
D
A technique of 300 mA, 100 ms and 75 kVp is employed to produce an image with appropriate quality. Using the 15% rule, fill in the values below that will maintain a similar quality radiograph. 300 mA 200 ms time ____kVp
64
How much voltage will be required to move a current measuring 6.3 amperes through a simple circuit containing a resistance of 4.1 ohms?
25.83 volts
Increasing the sampling frequency results in an increase in _________________.
spatial resolution
As the PSP plate size increases the spatial resolution _______________.
decreases
Indirect flat panel detectors are made of _____________.
cesium iodide
A technique of 300 mA, 100 ms and 75 kVp is employed to produce an image with appropriate quality. Using the 15% rule, fill in the values below that will maintain a similar quality radiograph. ___mA 600 ms time 64kVp
100
A satisfactory radiograph is made at a 180 cm SID using 50 mAs at 80 kVp. What new factors will produce a similar radiograph if an 120 cm SID?
22 mAs
mAs1/mAs2 = (Distance1) 2 /(Distance2) 2
Typically, the AEC minimum time is approximately:
1 ms
A satisfactory chest radiograph is produced using 8:1 grid, 35 mAs at 85 kVp. A second image is requested using a 12:1 grid. What mAs is needed to produce a second satisfactory image?
44 mAs
mAs1/mAs2 = gcf1/gcf2
A satisfactory radiograph is made at a 160 cm SID receptor distance using 40 mAs at 87 kVp. What new factors will produce a similar radiograph if a 80 cm SID is used?
10 mAs
A compensating filter such as wedge or boomerang is designed to compensate for:
differences in tissue thickness
In the image intensifier the electrostatic lenses are used to _______________________.
accelerate and focus the electrons
How much is the fluoroscopic image magnified if the input phospher size is changed from 25 cm to 12 cm?
2.1 magnification
MF = 25/12 = 2.1
Which of the following technical factors will decrease the effects of involuntary motion? A. 200 mA 100 ms and 85 kVp B. 800 mA .01s and 80 kVp C. 300 mA 200 ms and 75 kVp D. 600 mA .25s and 85 kVp
B
Which of the following statements are true? A. Details of the body smaller than the pixel cannot be recorded. B. The smaller the matrix the smaller the pixels. C. A smaller matrix size decreases spatial resolution. D. As sampling frequency increases the spatial resolution increases.
A & D
What is the ratio of a grid that has a grid strip thickness of 4 mm, a grid interspace thickness of 20mm and height of 160mm?
8:1
•A radiographer receives an exposure of 5 mSv/minute standing 200 cm SSD. In order to reduce this exposure to 1.25 mSv/minute, the radiographer should move to a distance of ___________.
400 cm SSD
The greatest modulation transfer function number is ____________.
one
A technique of 200 mA, 100 ms and 85 kVp is required to produce a radiographic image with the appropriate exposure. What new milliseconds could be used if a 800 mA station was desired?
25 ms
The port window in the x-ray tube is _____________.
thinner glass than the rest of the glass tube
A radiographer receives an exposure of 10 mSv/week at a 200 cm source-to-skin distance (SSD). What would this person's exposure have been at a 100 cm SSD?
40 mSv/week
The anode is ________ and is made of ______________.
positive; tungsten
The greater the bit depth the greater the number of ___________ can be seen on the image.
gray shades
A radiographer receives an exposure of 200 mSv/week at a 300 cm source-to-skin distance (SSD). What would this person's exposure have been at a 100 cm SSD?
1800 mSv/week
An increase in OID will have fewer shades of gray on the image causing the contrast to be longer scale.
False
As the atomic number increases, attenuation increases, and this results in a decrease in receptor exposure.
True
The AEC can adjust the exposure for a change in SID.
True
It will take three times as much exposure to use a 6:1 grid as compared to a non-grid.
True
The matrix size and the size of the field of view determines the pixel size.
True
Barium sulfate requires the use of high kVp over 100 and with iodinated contrast media the kVp should be 110 kVp
False
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