Radiographic Image Quality Flashcards
The “exactness of representation of the patients anatomy” on radiographic image.
Radiographic image quality
Required so that radiologist can “make accurate diagnosis”
High-quality image quality
to produce high-quality images, radiographers apply knowledge of the three major interrelated categories of radiographic quality:
-each influences the quality of radiographic image, each is under the control of radtech
Film Factors, Geometric Factors and subject factors
The anatomical structure that is being examined is “rendered on radiograph”
Fidelity
Radiographic image quality is consist of
Spatial Resolution
Noise
Artifacts
Contrast resolution
Is the “ability to image two separate objects” and visually distinguish one from the other
Resolution
Refers to the “ability to image small objects” that have high Subject Contrast, such as bone soft tissue interface, a breast microcalcification, or calcified lung nodule.
Spatial Resolution
When the spatial resolution is_______, the screen blur, motion blur and geometric blur is_________
High, Low
The “ability to distinguish anatomical structures of similar contrast” such as liver spleen and gray matter— white matter
Contrast Resolution
“refer to the degree of sharpness” of structural lines on a radiograph
Detail/Recorded detail
“Refers to the ability to visualize recorded detail” when image contrast and optical density (OD) are optimized
Visibility of detail
The “random fluctuation” in the OD of the image
Radiographic noise
When the noise is____, the contrast resolution is______
Low, high
The four components of noise
Film Graininess, Structure Mottle, Quantum Mottle, Scatter Radiation
“Refers to the distribution in size and space of silver halide grains” in the emulsion
Film graininess
“Refers to the size and space distribution of phosphor” of the radiographic intensifying screen
Structure Mottle
Film Graininess and Structure Mottle are inherent in the
Screen-Film image Receptor
“refers to the random nature” by which x-rays interact with the image receptor
Quantum Mottle
The use of _______,__________ and of______ reduces quantum mottle
High-mAs, low-kVp, slower image receptors
It describe the “sensitivity of film to x-rays”
SPEED
“Fast image receptors” have_____ noise, and______ spatial resolution and, ____contrast resolution
High, low, low
“High spatial resolution and high contrast resolution” require____noise, and ________image receptors
Low, slow
“Low noise accompanies” _____ image receptors with _______ spatial resolution and _____ contrast resolution
Slow, high, high
