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Chapter 2 Test Guide

Introduction to Radiographic Equipment

QuestionAnswer
The x-ray room has an area that protects the limited operator from scatter radiation & is called the: control booth
The mechanism on the x-ray tube crane that provides "stops" in a specific location is the: Detent
The absorption of x-rays by matter is called: attenuation
The image receptor (IR) system may consist of the following: Cassette and phosphor plate
A line that is perpendicular to the long axis of the x-ray tube and is the center of the x-ray beam is called the: central ray
The device that protects the IR from being fogged by scatter radiation is called a: Grid or Bucky
The device that allows the limited operator to vary the size of the radiation field is called the : collimator
The purpose of a safety check performed before making an exposure is to: protect the patient from unnecessary exposure
A radiation hazard exists in the x-ray room: throughout the room during an exposure
A type of filmless x-ray system that produces digital images is called: computed radiography (CR)
Digital images produced using the CR systems use an _________ to process the image. image reader device
The most frequent adverse incident that occurs in a radiology department is: falling
How can you determine the location of the central ray? Turn on the collimator light. The crosshairs in the center of the illuminated radiation field indicates the location of the center ray.
What is the location of remnant radiation? Between the patient and the film on the side of the patient opposite that of the x-ray tube.
What is meant by attenuation? Absorption of the x-rays beam in matter, usually the human body.
What component of the x-ray machine is located in the control booth? the control console (located in the control booth), and the transformer cabinet.
What should you do before attempting to move the x-ray equipment? Release appropriate locks
Where would you look to find a collimator? Is a boxlike device attached under the tube housing.
How might you determine the size of the radiation field without actually measuring it? measures 10-12 cm or more in thickness
List the four steps in a pre-exposure safety check. 1. The x-ray room door is closed 2. No non-essential persons are in the x-ray room 3. All persons in the control booth are completely behind the lead barrier 4. No image receptors are in the rooms except the one in use
How soon is it safe to re-enter the x-ray room after an exposure? Immediately x-rays travel at the speed of light and do not linger in the room. They are only present during an exposure.
Define the difference between primary and remnant radiation. Primary: the x-ray beam that leaves the tube and is unattenuated, except by air. Remnant: what remains of the primary beam after it has been attenuated by matter (the patient).
What are the common sizes of CR plates? 8x10, 10x12
Describe the Trendelenburg position. The position of the patient in which the head is lowered at least 15 degrees.
Describe the latent image. The latent image is the unseen image on the film after exposure.
Many x-ray projections are done with the patient standing or sitting upright using what device? Upright Bucky
Tube housing Surrounds the x-ray tube and is lined with lead
Tube port Opening where the x-rays exit the tube
X-ray tube Source of the x-rays
Scattered radiation The x-rays that strikes the patient and travel in all directions, inside & outside the body
Radiation fog Unwanted image exposure that is caused by scattered x-rays
Computed radiography (CR) Filmless x-ray system that uses a digital format to produce
Image receptor (IR) Receives the energy of the x-ray beam and forms the image of the body part
Created by: jenren18
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