Medical Imaging Test #3

KVP

quality

mA

quantity of radiation

XRAY tube includes

directional buttons, collimator, make track automatically imaging room

What does a control panel do

allows selection of technical factors (mA and KVP)

A table includes

bucky tray. Wall bucky may include bucky tray

Heat production in a XRAY tube

current heats cathode filament producing electron cloud (mA)

Electrons hit anode=thermionic emission

Law of Bergonie and Tribondeau

sensitivity of cells to ionizing radiation. infant’s cells are constantly dividing

Patient care standards 

-practice high quality imaging techniques

-prevent spread of disease

-prevent complications

-Alleviate suffering

-complete in a timely manner

Electron cloud production

current heats cathode filament producing electron cloud (mA)

CR vs DR

Direct Radiography: delivers near instant images via flat panel detectors. Expensive but better-quality images

Computed Radiography involves a 2-step process with phosphor imaging plates. Cheaper and portable

Contrast in Imaging

KvP controls contrast. Contrast is given to show a better image, detailed.

mA’s control

mA’s determine the current, flow of electrons for a certain amount of time

Radiographic Densities

Primarily matter of the atomic number making up tissues:

-Air or Gas

-Fats

-Water

-Muscle

-Bone

-Tooth enamel

Fluoroscopy

-Live action of the interior body

-Types: C Arm, below table XRAY tube is located inside the XRAY table

-Monitors (TV)

-Radiologist operates 

Small bowel exam

A person drinks a contrast agent, which allows the small bowel to be visualized using XRAYS

Arthrogram

Used to evaluate the structures in and around joint space. An ionated contrast medium is injected directly into the joint space

External patient prep

History, explain procedure, remove objects that would interfere with procedure

Internal prep

fasting, removing of fecal

Vein imaging

venogram: study of veins after injection of contrast

Biliary system imaging

Diagnose abnormalities in the biliary system

Contrast medium injected into common bile duct after fibrotopic scope is passed into esophagus, stomach

Myelogram Imaging

Generally replaced by MRI

-Examination of the spinal cord

-water soluble contrast injected

-fluoroscopy

Cathode

A negative electrode

Digital Radiography

Uses imaging plate that remains in place inside of xray table or wall unit