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38 Cards in this Set
- Front
- Back
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As the SID decreases, the magnification?
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Increases
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As the OFD increases, the detail?
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Decreases
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Another name for the Edge Effect is?
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Penumbra
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What is the effect of a larger anode disc angle?
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Dissipates more heat (=less heat)
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With a wrist xray, how do you position the area of complaint?
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Closer to anode side of tube.
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What is the function of the line compensator?
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Calibrate the kV.
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On a single phase xray unit, in what increments does the knob adjust the voltage supply?
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Minor = 2 kV; Major = 10 kV
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When working on a single phase machine, in what order do you ALWAYS set the factors?
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mA, seconds, kV
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What is the name of the device which measures the quantity of radiation reaching image receptor?
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Automatic Exposure control
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On what side is the radiation intensity the greatest?
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Cathode side
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If you the factors are the SAME but the distance of the tube changes from 40” to 80” what is the effect on the density at 80” in relation to 40”?
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Decrease by ¼
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What is the effect when tube moves from 40” to 80”:
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a. Magnification – Decreases
b. Detail – Increases |
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With an upright AP lumbar film, which end of the tube should be up?
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Anode side
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On a table, with a lateral lumbar view, how should the body be positioned?
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Head towards the anode.
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On a table, with a lateral thoracic view, how should the body be positioned?
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Head towards the cathode.
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On a table, with an AP thoracic view, how should the body be positioned?
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Head towards the anode
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When an upright tube is installed, which part of the tube is up?
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anode
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What is used to adjust for the change in thickness and density of the body?
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Compensating Filter
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What was roentgen working on when he discovered xray?
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Crooke’s tube
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When did he discover xray?
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11/8/1895
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Who was first person xray’d for medical purposes?
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Mrs. Roentgen
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What was first body part xray’d?
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Hand
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Where was first medical xray in US?
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Dartmouth college
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What is function of tube housing?
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a. Reduces intensity of leakage of radiation
b. Prevent electric shock |
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What is function of focusing cup?
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Focuses the electron beam towards the anode
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What is the name of the process of “boiling off” of the electrons in the outer shell of the filament atoms?
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Thermionic emission
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What are three body parts that require a large focal spot
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a. thoracic
b. lumbar c. pelvis d. hip |
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If you have 50 kV with 100 mAs and then increase to 100 kV with 100 mAs, what is the result?
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More generating power but no change in the density of xray
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Which rectifying machine has the smallest voltage ripple?
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High frequency
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What is the name of the chart which gives a safe kVp and time for a given mA?
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Tube rating chart (aka Radiographic rating chart)
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With the spinning top test on a single phase rectifying machine, an exposure of 1/10th seconds would result in how many dots?
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120 pulse/sec x 1/10 = 12 dots
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What is the only advantage to using the highest mA setting with the least amount of time?
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Less motion = more detail
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What is the only advantage to using the lowest mA setting with the most amount of time?
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Less heat
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What are the heat units for a high frequency machine if the mA is 100, the time is 1/10th second, and the kV is 80?
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1120 HU
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What is the rotor made of?
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Iron
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What is the function of the stator?
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Series of copper wire loops which create an electromagnetic charge.
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What is the name of the chart which gives you the mAs and kVp settings for a specific view?
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Technique chart
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What xray factor is directly related to the density of the film?
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mAs
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