X-Ray Production
Attempts to narrow the stream of electrons as it leaves the cathode filament.
What is Focusing cup?
What is LUT?
Convert X-ray energy to light energy
What is input phosphor?
Radiation intensity of sequential exposure should not vary more than 5%.
What is exposure reproducibility?
What is the formula of Grid Ratio?
Grid ratio = Height/Distance
A variable transformer; operates on the principle of self induction; allows the manipulation of kVp and mA.
What is Autotransformer?
What is Quantization?
Convert light energy to electron energy
What is photocathode?
Tested to verify the reproducibility of exposure using phantoms to simulate variations in patient thickness
What is AEC?
Lead strips are parallel to one another.
What is Linear grids?
A projectile electron misses outer shell electrons int he target and moves in close to the nucleus.
What is Brems radiation?
What does DICOM stand for?
Digital Imaging and Communications in Medicine
Keep electron beam narrowed as it travels toward output phosphor.
What is Electrostatic lenses?
Tested using a digital dosimeter; half value layer measurement is required.
What is filtration beam quality?
What are the factors controlling distortion?
Size and Shape
Collection of all different energies (wavelengths) of x-rays in a typical x-ray beam.
What is X-ray emission spectrum?
Convert exit radiation first to visible light and then to electrical charges; uses Charge Coupled Device or Complementary Metal Oxide.
What is DR indirect detectors?
The feature that automatically adjusts kVp and mA during fluoroscopy is called:
ABC ( Automatic Brightness Control)
Complete program in a radiology department that addresses all aspects of quality, including customer service, image interpretation, accuracy of diagnosis, and distribution of radiologists' reports.
What is Quality Assurance?
Computer keeps the images at uniform brightness and contrast regardless of exposure used.
What is rescaling?
An Xray beam containing many numbers energies
What is Heterogenous?
Ability of the digital system to accurately record spatial frequencies.
What is Modulation Transfer Function ?
Gain in brightness caused by acceleration of electronic beam inside image intensifier tube.
What is flux gain?
Adjacent mA stations should be within 10% of one another.
What is exposure linearity?
The highest spatial resolution that can be recorded, controlled by pixel pitch.
What is Nyquist frequency?