Radiographic Quality
This poor image quality is caused by too few x-ray photons hitting the image receptor.
Quantum mottle
This type of equipment relies on excellent positioning skills and extensive knowledge of surface and internal anatomy because the part being radiographed must be accurately positioned over the ionization sensors.
Automatic Exposure Control (AEC)
The component used to absorb low energy x-rays leaving the tube
filtration
This is a graphical display of the pixel intensity distribution for a digital image
Histogram
This is the universal protocol for transmitting data in PACS and contains the patient's name, DOB, and type of study
DICOM
As you increase OID, this happens to contrast
Contrast increases
In this type of radiography the image receptor is an imaging plate made of photostimulable phosphors made of Barium Fluorohalide
Computed Radiography (CR)
This part of the circuit is also known as the variable transformer, its the source for selecting kVp, and provides for the variation of voltage flowing in the x-ray circuit and applied to the x-ray tube.
Autotransformer
The xray beam changes as it travels through the patient by a process called...
Attenuation
Higher energy x-ray beams have fewer _____ interactions than x-ray beams with lower energy
Photoelectric
This refers to the ability of the imaging modality to distinguish between small structures that are very close together
Spatial Resolution
When the FOV stays the same and the matrix size increases, what happen to pixel size?
Pixels get smaller
This allows electrons to flow in one direction only from cathode to anode
rectifier or diode
This is the process of combining multiple radiographic images with overlapping fields of view to produce a single image
Stitching
This is a plan of action to ensure that a diagnostic x-ray facility will produce consistent, high-quality images with a minimum of exposure to patients and personnel
Quality Assurance
Improper alignment of this will result in shape distortion
Central ray, IR, and body part
This is used in digital radiography to provide feedback to the technologist regarding the proper radiographic techniques for a specific exam that achieves an optimal image
Exposure Index
The line focus principle expresses the relationship between...
The actual and effective focal spot
This function increases visibility and contrast of small, high-contrast structures
Edge Enhancement
This is a measure of the capacity of the system to pass its spatial resolution characteristics to the final image
Modular Transfer Function
A system that has a higher bit depth will have what affect on contrast resolution?
Higher Contrast Resolution
What is the main difference between indirect and direct conversion detectors in image production?
Direct conversion:
exit radiation straight to electrical charge
Indirect Conversion:
exit radiation to light to electrical charge
The electricity provided to the radiology department operates at...
120 pulses/sec
This degrades image quality and can be produced by: hardware failure, operator error, and software errors
Image Artifacts
This component converts light to an electric signal
Photodetector or photodiode