medical imaging

Question 1

Radiographs

Answer 1

beam of ionizing radiation, (beam->body->film), image created by differences in density, less dense=more nrg=more film exposure=black; more dense=less nrg=less film exposure=white; some tests use injected contrasting media

Question 2

X-ray use

Answer 2

chest or bone x ray

Question 3

Fluoroscopy

Answer 3

continuous/intermittent x-ray images taken to observe dynamic body processes - planar x-ray radiograph

Question 4

Fluoroscopy use

Answer 4

barium swallow; renal blood flow

Question 5

AP

Answer 5

anterior to posterior

Question 6

PA

Answer 6

posterior to anterior

Question 7

CT

Answer 7

computed tomography

Question 8

CAT

Answer 8

computed axial tomography

Question 9

Tomography technique

Answer 9

X-ray tube rotates around patient, data digitized and converted to cross-sectional images/slices of body, images are free of overlapping anatomy

Question 10

Tomography uses

Answer 10

broken bones, blood clots, heart disease, internal bleeding, cancer

Question 11

Endoscopy

Answer 11

a long thin tube w/ camera on the tip, inserted into body, requires pt sedation and local anesthetics

Question 12

MRI

Answer 12

magnetics resonance imagine

Question 13

NMR

Answer 13

Nuclear magnetic resonance

Question 14

Magnetic Resonance imaging

Answer 14

strong external magnetic field applied, nuclei align w/ external field, external field is turned off and radiofrequency signal is emitted when protons return to their original position, gives highly detailed cross-sectional images

Question 15

MRI uses

Answer 15

evaluate organs and structures

Question 16

Gamma Ray Imaging

Answer 16

pt given radiopharmaceutical drug(which concentrates in a specific organ) plus a gamma photon emitting radioisotope, pt scanned w/ gamma photon detecting camera – provide info on organ or tissue

Question 17

PET

Answer 17

positron emission tomography

Question 18

Positron emission tomography

Answer 18

pt given positron emitting radiopharmaceutical, tissues w/ greater metabolic activity(tumors) take up more glucose –> emit more photons, color-coded images

Question 19

PET uses

Answer 19

detect, locate and stage cancers

Question 20

Ultrasound/sonogram

Answer 20

high-frequency sound waves delivered to various body parts, images created from returning sound waves that differ according to densities of boundaries between tissues w/ different densities - no ionizing radiation exposure

Question 21

Ultrasound uses

Answer 21

view heart, blood vessels, kidneys, liver, and fetus, TTE, TEE

Question 22

TTE

Answer 22

transthoracic echocardiography

Question 23

Transthoracic/Transesophageal echocardiography

Answer 23

cardiac echo - echocardiography - performed across chest wall/through the esophagus

Question 24

TEE

Answer 24

transesophogeal echocardiography