Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

Normal Size Small Size show me how

Rd Im. 2

Ch. 18-23, 25, 26

Question	Answer
The basic photometric unit is the	lumen
A digital display monitor is best viewed	straight on
A liquid crystal is a material in a state between a liquid and a	solid
Almost all digital images in medical imaging are viewed and interpreted on a	digital display device
Medical flat panel display devices are _______ liquid crystal displays.	monochrome
Medical flat panel display devices are identified by the number of	pixels; active matrix
Compared to CRT's, AMLCD's have better _____ and less intrinsic _______	contrast; noise
The ambient light at a digital image workstation should be near	darkness
Preprocessing the digital image is done ____ and post processing is done ____.	automatically; manually
Flatfielding is accomplished through automatic calibration images called ____ and ____ images.	offset; gain
Reregistering an image to correct for patient motion is done with	pixel shift
Signal interpolation is performed during	preprocessing
The national standard for image transmission in teleradiology is the	DI COM format
Image field size is determined by	matrix size and gray scale
A screen film radiographic artifact is any irregularity on an image that is not caused by the proper imaging or tissue by primary	xray beam
A foreign object is an example of	exposure artifacts
A guide-shoe mark is a	processor artifact
The largest number of repeats is generally caused by	exposure artifacts
Misalignment of the processor turnaround assembly can cause	guide shoe marks
Thin lines on the leading or trailing edge of a film are	guide shoe marks
Only patients can cause image	blur
Kink marks are caused by	bending the film
A quality assurance program monitors	people
A quality control program is for all instrumental and	equipment
The determination of how consistently radiologist's image interpretation match patients' ultimate diagnoses is called	outcome analysis
A quality ___ program monitors people.	assurance
What does JCAHO mean	joint commission on accreditation of healthcare organization
Why do hospitals have quality control and quality assurance programs	ensure quality patient care, receive payment, JCAHO approval
Most quality control testing on radiographic equipment is done	annually
Filtration is measured with	half value layer measurements
The collimator must be accurately aligned to within + or -	2% of the SID
The measure of kVp should be within + or - ___ of the kVp indicated on the console.	10%
A positive beam limitation (PBL) device in involved in	collimation
A ghost image can occur in digital imaging because of incomplete	erasure
_____ is done during preprocessing to correct for _____ over the image	flatfielding; irregular patterns
___ is done during the imaging, flatfielding is done during the preprocessing, and lossless compression is done during post processing	partitioning
CR cassettes can sit for a few _____ between exposures.	days
Lossless compression reduces data files by a ratio of	10:1
Lossy compression reduces data by a ratio of	100:1
Computer aided diagnoses (CAD) requires the use of	uncompressed images
Each anatomic part has an image ____ with a characteristic shape	histogram
Medical images are transferred using the	DI COM standard
Soft tissue radiography is unique because of the	low subject contrast
When doing soft tissue radiography the differential absorption between muscle and fat must be	enhanced
Breast tissue tends to be increasingly ___ in older women	fatty
About ___ of breast cancer occurs in the ductal tissue	80%
The American Cancer Society recommends all women ___ years of age and above have an annual screening mammogram	50
The ACS recommends biannual screening for all women age	40 to 49 low risk
A dedicated mammography unit should have an automatic	adjustable compression device
Every dedicated mammography unit is equipped with a	low ratio grid
Breast compression has the advantage of lowering	patient does, motion blur, and superimposition
Breast compression is used to lower patient dose and	reduce focal spot blur
Cassettes used in mammography are designed with tighter	film screen contrast
During fluoroscopy the xray tube is operated at less than	5 mA
The image intensifier improved fluoroscopy by increasing image	brightness
Visual acuity in the eye is greater at the fovea centralis where	cones are concentrated
The ability of the eye to detect differences in brightness levels vision is termed	contrast perception
The rods in the retina are stimulated by ___ light; the cones are stimulated by _____ light.	low; bright
Xray that exit the patient during fluoroscopy first interact with the	input phospher
The input phosphor convert xrays to	light; cesium iodide
The number of light photons emitted within the image intensifier is directly proportional to the amount of xray photons	exiting the patient
Light produced at the output phosphor has been increased	50-75 times in intensity
The ratio of xrays incident on the input phosphor to light photons exiting the output phosphor is called	flux gain
The ability of the image intensifier to increase the illumination level of the image is called the	brightness gain
An image intensifier tube is identified by the diameter of the	input phosphor
Fluoroscopy for an air contrast barium enema is generally done at	80 to 90 kVp
Viewing the fluoroscopy image in magnification mode increase	contrast resolution, spatial resolution, and patient dose
Automatic brightness control (ABC) maintains the brightness of the image by varying	kVp and mAs
Digital fluoroscopy uses at least	2 monitors
The time it takes to turn on the digital fluoroscopy xray tube and reach the selected mA and kVp is the	interrogation time
The charged coupled devise used in digital fluoroscopy provides	high spatial resolution, high signal to noise ratio, and high detective quantum efficiency
Digital fluoroscopy dose rate is lower than that for continuous analog fluoroscopy because the images are	discrete, not continuous

Created by: 10153696170312934

Popular Radiology sets

Medical Terminology 1-6

A cumulative run through physics in Radiology

Abdomen Review

Chest Positioning

Radiographic Exposure

Contrast info, Density info

Upper Extremities

X-Ray Tube

Cervical/Thoracic Spine

Radiology Terminology

Mock Fluoro Exam

ARRT registry review covering Unit 5: Radiation Protection

"Know" box contains:
Time elapsed:
Retries: