RADIOGRAPHIC IMAGE QUALITY Flashcards
is the
exactness of representation of the patient’s
anatomy on a radiographic image.
RADIOGRAPHIC IMAGE QUALITY
are required so that
radiologists can make accurate diagnoses.
HIGH QUALITY IMAGE
To produce high-quality images, radiographers
apply knowledge of the three major interrelated
categories of radiographic quality
film factors,
geometric factors, and subject factors.
Refers to the___ with which the anatomical structure that is
being examined is rendered on the radiograph.
FIDELITY
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 a bone–soft tissue interface, a breast
microcalcification, or a calcified lung nodule.
SPATIAL RESOLUTION
is the ability to distinguish anatomical structures of
similar subject 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
noise is the random fluctuation in the OD of the image.
Radiographic
4 COMPONENTS OF NOISE
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
refers to the random nature by which x-rays interact
with the image receptor.
– principal contributor to noise
Quantum mottle
The use of ____ and of ___ reduces quantum
mottle.
high-mAs, low-kVp ,slower image receptors
