Test 2 (Bush) C17-22 Flashcards
A digital display monitor is best viewed ______________.
straight on
Almost all digital images in medical imaging are viewed and interpreted on a __________________.
digital display device
The ambient light at a digital image workstation should be ______________.
near darkness
T or F: The purpose of image subtraction is to enhance contrast.
true
T or F: Spatial resolution improves with the use of higher megapixel digital display devices.
true
PACS stands for _______________________________________.
Picture Archiving and Communication Systems
Which is not a part of PACS?
Electronic medical record
Radiology Information Systems (RIS) is used for which of the following?
Schedules, protocol descriptors, and diagnostic conclusions
Within a PACS network the secretarial workstation and the viewing workstation would both be called ________________.
clients
The process of remote transmission and viewing of medical images is known as ________________.
teleradiology
The national standard for image transmission in teleradiology is the ____________ format.
DICOM
The term network is used to describe the _____________.
manner many computers can be connected
What does DICOM stand for?
Digital Imaging and Communications in Medicine
T or F: Teleradiology allows for intercontinental image interpretation.
true
T or F: The Current Procedural Terminology (CPT codes), developed by the American Medical Association (AMA), created codes for a specific clinical situation.
true
Accession Numbers are specific numbers that are assigned to a patients exam they are attached to each ___________ in that exam which in turn attaches a ___________ to that specific patients exam after a radiologist has performed their dictated interpretation.
image , report
Image perception is a scientific term for what we call visual ______________.
sensitivity
The decreasing luminous intensity with increasing distance from the source of light follows _____________________.
the inverse square law
A principal advantage of digital imaging over analog imaging is ____________________.
image brightness
Light incident on the eye must first pass through the _________________.
cornea
The interpretation of a digital medical image by a radiologist is a two-step process; _________________ followed by ______________.
global impression; visual search
The process of matching any worker to the work environment to maximize efficiency is ______.
ergonomics
Digital radiography is superior to analog radiography because of __________________.
image brightness
SMPTE stands for the _____________________________________.
Society of Motion Picture and Television Engineers
A standard pattern made to measure the resolution of digital display systems is called the _______________________.
SMPTE pattern
The standard for Digital Imaging and Communication was developed by a committee of the ______________.
ACR and NEMA
There are _______ types of photometers commonly used.
two
A photometer is a _____________________.
luminescence meter
A high-quality medical image should always demonstrate ____________.
structures and tissues
Spatial resolution improves with decreased
focal spot size, motion and pixel size.
_________ is defined as the ability to distinguish anatomical structures of similar subject contrast and visually detect one from the other.
Contrast resolution
Radiographic __________ is random fluctuation of x-ray interaction on the image receptor.
noise
Which of the following is the principal contributor to image noise in radiographic and fluoroscopic imaging procedures?
Quantum mottle
Which of the following will reduce quantum mottle?
High mAs, low kVp, and slower image receptors
Higher speed image receptors generally produce images with ____________________.
increased noise
The three primary geometric factors affecting image quality are ________________________.
magnification, distortion, and focal spot blur
What is the formula for the magnification factor?
MF = SID/SOD
The best way to minimize magnification is to use a __________.
long SID and small OID
Focal spot blur can be reduced by using __________.
a small focal spot
Subject contrast is affected by ___________.
patient thickness
Distortion can be reduced by ____________________________.
placing the object plane perpendicular to the image plane
Focal-spot blur is small on ______________ side and large on the ___________ side of the image receptor.
anode; cathode
Image-forming x-rays include those which have been _________________.
transmitted without interaction and scattered through Compton interaction
Which kVp selection would result in the most scattered x-rays in the image-forming beam?
90 kVp
Compton scatter contributes to _____________.
image noise
The three primary factors influencing the intensity of scatter in the image-forming beam are ___________________.
kVp, field size, and patient thickness
Decreasing the kVp will increase ___________.
patient dose
The x-rays that are transmitted through the patient without interaction contribute to ______________.
useful information
Contrast resolution is improved by _____________.
tight collimation, lowering kVp and patient compression
The most commonly used beam restricting device is the ____________.
variable collimator
Lowering kVp ________ patient dose and _________ image contrast.
increases; increases
The use of __________ improves contrast and reduces patient dose.
collimation
How can you improve image contrast with a heavy patient without increasing patient dose?
Use tight collimation.
Scatter radiation increases as ___________________ increases.
field size
The use of a compression device will increase __________.
image contrast
