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X-rays, X-ray circui
chap 5,6 X-ray production & X-ray circuit & tube heat mgmt
| Question | Answer |
|---|---|
| chap 5 - Name the 4 essential requirements for production of x-rays | #1. vacuum, #2. a source of electrons #3 a target, and #4 a high potential difference (voltage) between the electron source and the target |
| Roentgen discovered x-rays while working with a _____________ tube | Crookes |
| an "electron cloud" surrounding the filament of the cathode is referred to as a _______ ________. | Filament |
| The creation of the space charge in the x-ray tube produces ____________ ____________. | thermonic emission |
| the majority of photons in the x-ray beam are created by what process? | Bremsstrahlung interactions |
| More than 99% of the energy of the electron stream is converted into ______. | heat |
| The high speed rotation (10,000 RPM) of the anode enables ________________________________. | greater dissipation of heat from high technical factors |
| The degree of angulation of the x-ray tube target will deterimine the ________________________. | heat capacity of the tube |
| A dual purpose x-ray tube has _______________. | 2 filaments, 2 focal spots sizes, 2 anodes |
| the anode heel effect is a phenomenum of x-ray production that results in __________________. | uneven distribution of radiation within the x-ray field |
| to take advantage of the anode heel effect when making radiograph of femur in recumbent anteriorposterior projection on 14 x 17 inch image receptor (IR) at 40 inch source image receptor distance (SID) the patient should be placed so the _______________ | head is toward the anode end of the tube |
| the penetrating power of x-ray beam is controlled by varying the ________________. | peak kilovoltage (kVp) |
| the rate of current flow across the x-ray tube is measured in _____________________ | mA millameres |
| Doubling the mA will result in #1 increased patient dose 2. twice as many photons in x-ray beam 3 increased radiographic density | D #1, 2, n3 |
| the unit used to indicate total quanitity of x-ray exposure is A. mA B. seconds (of exposure time) C. kilovolts D. millianpere-seconds (mAs0 | D. milliampere-seconds (mAs) |
| an x-ray exposure made using the following: 200 mA, 0.02 sec, 70kVp, 40inch SID The value of the mAs for this exposure is ____________ | mA x time= mAs 200 x 0.02= 4 |
| the device for removing long wavelength radiation from the primary x-ray beam it the __________ | B The filter |
| X-ray equipmt capable of producing 70 kVp or more is required to have total filtration of at least ______________. | D 2.5mm Al equiv |
| the purpose of rotating the anode of the x-ray tube is to _____________________ | increase the heat capacity of the anode |
| image sharpness is determined by the __________ A. size of electron stream B. size of the actual focal point C. size of the effective focal spot D. speed of rotation | B size of the actual focal spot |
| Above 70 kVpm what % of photons is created by the Bremsstrahlung process | 85% |
| The amt of detail see in the x-ray image is refered to as _________ | B Contrast |
| Chapter 6 X-ray Circuit & Tube Heat Mgmt | free space |
Created by:
aprilstreet