Diagnostic Tests Flashcards
Xrays are sometimes referred to as _______ rays, which are named after their discoverer, Wilhelm Konrad Roentgen.
Roentgen rays.
X-ray films are produced by exposing __________ to the __________ from an ___________.
X-ray films are produced by exposingsensitized filmto theenergy wavesfrom anx-ray generatoror acathode ray tube
When part of a body is positioned between an x-ray source and sensitized film, the result is a _______ of that body part.
an image or a shadow
_________ appear in various shades of black, white and gray.
Radiographs
Ther areas where x-rays _________ appear black.
Ther areas where x-rays strike the film directly appear black.
The areas where the x-rays are ________ appear in shades of white or gray.
The areas where the x-rays are blocked by tissues of varying densitiesappear in shades of white or gray.
_______ appears on the film as a shade of gray, and _____ appears as a shade of white.
Soft tissue - less denseappears on the film as a shade of gray, and bone - relatively denseappears as a shade of white.
What are 6 characteristics of X-rays?
X-rays Cause exposure of a photographic plate
Penetratedifferent substances Invisibility Travel instraight lines
Scatteringof radiation Ionization
EPISSIExposure, penetration, invisibility, straight lines, scattering, ionization
A _______ usually takes the films while a _______ interprets and performs intervening procedures.
A technicianusually takes the films while a radiologist interprets and performs intervening procedures.
A _______ is a medical doctor with years of special training in medical imaging.
Radiologist
When the photographic plate is placed in front of x-ray beams, the x-rays have the ability to change the plate from ____ to ____.
When the photographic plate is placed in front of x-ray beams, the x-rays have the ability to change the plate from silver to black.
T or F. X-rays oass through body substances with varying ease.
True.
_____ is the least dense substance and exhibits the greatest transmission
Air.
What is the least dense and most dense between fat, water (soft tissue) and metal (bone)?
Fat is theleast densebut isdenser than air. Water or soft tissue is denser than fat. Metal or bone is the most dense.Least dense to most dense:Fat > water > metal
______ is the most dense and transmits the least.
Metal orboneis the most dense and transmits the least.
What does it mean when a substance absorbs x-rays?
The x-rays arestoppedby the substance.
T or F. If the x-rays are absorbed by the denser body substance (e.g. bones), they don’t reach the photographic plate held behind the patient, and white areas ar left in the x-ray film.
True.
_________ structures permit the passage of most x-rays and appear black on x-ray film.
Radiolucent
_______ structures obstruct the passage of x-rays and appear white on x-ray film.
Radiopaque.
T or F. X-rays can be detected by sight, sound, or touch.
False.
Workers exposed to x-rays must wear a ________ to detect and record the amount of radiation to which they have been exposed.
A film badge.
X-ray characteristic of travelling straight lines allows for the formation of ______ shadow images on the x-ray plates.
X-ray characteristic of travelling straight lines allows for the formation of precise shadow images on the x-ray plates.
T or F. Straight x-ray beams allows beams to be directed accurately at a tissue site during radiotherapy.
True.
___________ occurs when x-rays come in contact with any material.
Scattering.