Radiographic Quality
Digital Radiography
Image Recpetors
Special Procedures
Ultrasound
100
The density difference between two adjacent areas on a radiograph
What is radiographic contrast?
100
List 3 advantages of using digital radiography over traditional radiography.
Faster, no chemicals, less retakes, can adjust, can measure and zoom, easily store images and send them, follow-up films are easier because everything is saved
100
What is the purpose of intensifying screens?
Reduce the amount of radiation exposure required
100
List one type of negative-contrast agent.
air, nitrous oxide, carbon dioxide, oxygen, nitrogen
100
List 2 benefits of ultrasound.
info about organ structure and function, helps focus differential diagnosis, debilitated pateints
200
The degree of blackness or darkness on a radiograph
What is radiographic density
200
What is the globally accepted form to send digital radiographs via the internet and to court?
DICOM
200
Film speed is determined by what?
size of silver halide crystals - fast film has large crystals and require less radiation
200
List two things you should make sure happens to a patient before they have a GI study performed.
NPO 12-24 hours, enema 4-12 hours
200
The tissue reflects no echoes and appears black
What is anechoic
300
A device placed between the patient and the radiographic film that absorb non-image-forming x-rays (scatter)
What is a grid?
300

STH had this type of panel before DR

CR

300
A thicker phosphor layer on an intensifying screen means x-ray absorption and light emission is __________________ and the image has ______________ detail.
increased, decreased
300

List two reasons why providers order cystograms?

bladder stones, tumors, calculi, bladder rupture

300
Define hyperechoic.
Tissues reflect more sound back to the transducer than the surrounding tissues; reflects brighter white than surrounding tissues
400
Rank the following substances from lowest to highest according to their densities - water/fluid, metal, fat, gas, bone
gas, fat, water/fluid, bone, metal
400

The correct term for 3D portion of Mammography

Tomography

400

Small phosphor crystals in an intensifying screen have ___________ light emission, require ____________ radiation, give ___________ detail, a ______________ image.

less, more, more, better

400
List 2 precautions when doing a cystography.
get urine sample first, proper urinary catheter technique, clean leaked urine off patient, proper distention of bladder, do not use barium sulfate, room air may cause embolism if there is an active bladder hemorrhage
400
Why is it difficult to perform ultrasounds on the GI tract?
Gas reflects sounds and prevents imaging of deeper structures and feces cause shadows
500
Rank the following substances from lowest to highest according to their x-ray penetrability - water/fluid, metal, fat, gas, bone
Metal, bone, water/fluid, fat, gas
500

Explain how a flat panel detector digital radiograph machine works.

There is a large x-ray intensifying screen coupled to an amorphous silicon panel or amorphous selenium panel serving as a light detector. Each detector is composed of a light sensitive area and a smaller area of electronics. The light is converted into a digital signal and the image is processed and read.

500
Intensifying screem speed is governed by 4 things. What are three of them?
Size of crystals, phosphorus layer thickness, reflective layer efficiency, dyes in phosphorus layer
500
List three downfalls with using a water-soluble iodine preparation when doing a GI study.
Fast transit time, hypertonicity, rapidly absorbs fluid in the alimentary tract losing contrast, becomes dilute, mucosal detail is poor
500

brand of ultrasound machines at STH

Philips

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