operation, QA, acquisition, and evaulation
Help!
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| Fixed spatial resolution characteristic of direct digital systems is determined by | TFT DEL size
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| What is foreshortening? | an object is placed at an angle on the detector (object not flat)
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| grid absorption of useful beam | grid cutoff
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| what is bit depth | number of bits per pixel which has an effect on the gray scale
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| a technique of 85kV and 10mAs with no grid. what mAs is needed with a 8:1 grid | 40 mAs
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| what gird ratio is similar to the air gap technique | 6:1 ratio
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| formula for magnification | SID/SOD
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| formula for heat units | # of exposures*kVp*mA*seconds*generator
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| multiplier for a three phase 6 pulse generator | 1.35
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| multiplier for three phase 12 pulse | 1.41
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| find the new intensity for an AP chest x-ray at 55 inches, with an intensity of 50mR. The new distance is 72 inches. | 29.2
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| old mAs is 10 with a 6:1 grid. find new mAs with a 16:1 grid | 20 mAs
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| purpose of fuses on the xray circuit | safety to protect equipment. will stop exposure if there is too much voltage
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| what is an autotransformer | single coil transformer, operates on self induction, minor adjustments in kVp
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| anode is positive or negative | positive
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| cathode is positive or negative | negative
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| kvp is quality or quantity | quantity
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| mAs is quality or quantity | quality
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| what type of histogram is used for extremities | type 1
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| what histogram is used for KUB's | type 2
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| what histrogram type is used for contrasted exams | type 3
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| primary coil of the high voltage transformer receives what current | AC
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| energy needed to eject k-shell electrons from a tungsten atom | 70 kVp
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| three causes for tube failure | 1. vaporized tungsten
2. pitted anode
3. cracked anode
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| the x-ray tube is a | vaccuum
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| what is needed to find the total filtration | additive and inherent filtration
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| less than 1% of the energy from electrons are turned into this | x-rays
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| what relationship does the line focus principle show | actual and effective focal spot
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| characteristics of tungsten include | 1. heat dissipation
2. high melting point
3. high atomic number
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| what is thermionic emission | electron cloud within the x-ray tube is the product
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| what is aec used for | ensure reproducible radiographs regardless of tissue differences
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| circuit device that permits electrons to flow in one direction | resistors
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| what voltage must the primary side of the x-ray circuit be at | 220 volts
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| what percent of voltage ripple happens in a 3 phase 12 pulse have | 4%
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| how much voltage ripple occurs in a high frequency generator | less than 1%
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| 3 parts of the x-ray circuit | primary, secondary, and filament circuit
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| what is located between the secondary coil of the high voltage transformer and the x-ray tube | filament circuit
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| how is pixel size determined | dividing FOV by matrix
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| interrogation time is | the time needed for the x-ray tube to turn off
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| what are the two types of AEC | ionizing chamber and phototimer
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| what does bit depth identify | gray scale values
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| what effects spatial resolution | OID, SID, focal spot size, and motion
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| magification is effected by | OID and SID
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| elongation and foreshortening are effected by | tube alignment of x-ray tube, anatomic part, and IR
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| visibility factors are | brightness, contrast, and noise
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| what describes DQE | percentage of detected incoming x-ray photons
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| terms used to describe distortion | magnification, elongation, and foreshortening
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| percent of incoming x-ray photons that are identified and absorbed by the detector describes | DQE
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| focal spot blur is greatest | toward the cathode end of the x-ray beam
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| true or false: SID has no effect on contrast | true
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