Intro to Diagnostic Imaging
The negative side of the x-ray tube.
What is the cathode?
Stands for "as low as reasonably achievable."
What is ALARA?
The cranial collimation border for thoracic radiographs.
What are the shoulder joints?
What is mAs?
Radioisotope used to image and treat hyperplastic feline thyroid tissue.
What is iodine-131
Housed within the focusing cup on the cathode
What is filament?
The primary source of radiation exposure for radiation workers.
What is scatter radiation?
The proper way to measure object thickness.
In the position for the radiographic view.
This artifact is minimized when the object is as close to the image receptor as possible.
What is magnification?
Uses a strong magnetic field and radio waves to produce an image.
What is magnetic resonance imaging?
The subatomic particles super-heated to produce x-rays.
What are electrons?
Measures absorbed radiation.
What is a dosimeter?
The caudal borders of the scapulae.
What is the center beam position for thoracic radiographs?
Relative level of contrast preferred for radiographing bone?
Imaging modality that uses radioisotopes to localize areas of increased cellular metabolism.
What is nuclear scintigraphy?
The main type of energy produced within the x-ray tube.
What is heat?
The part of the cell most vulnerable to the affects of ionizing radiation.
What is DNA?
Artifact that occurs when the primary x-ray beam is not perpendicular to the area of interest
What is distortion? (or What is elongation?)
Adjustment to kVp needed to decrease contrast.
What is increase kVp (by at least 15%)?
Appears gray on radiographs and black on ultrasound.
What is fluid?
The concept that the density of x-rays emitted from the x-ray tube is higher near the cathode.
What is the Heel effect?
The ability of radiation to transfer energy into tissue.
What is linear energy transfer?
How to tell the femurs are adequately rotated in an extended-leg V/D pelvic radiograph.
Patellas are centered within the trochlear groove of the distal femurs.
Adjustment needed when penetrability is good, but the image is too light.
What is 50% increase in mAs?
Used to enhance the visibility of structures what are otherwise difficult to differentiate.
What is contrast media?