A6 Imaging

Question 1

History

Answer 1

Novermber 1985 Willhelm Roentgen discovers xrays

March 1896 Xrays used for medical diagnostics

late 1896 first radiotherapy

1901 roentgen wins first nobel prize in physics

Question 2

Methods for Imaging

Answer 2

Transmission: Beam passes through tissue
-xray CT (need multiple for complete picture)

Emmision: Tissue produces signal
-MRI Nuclear

Reflection: Beam bounces off tissue
-Ultrasound

Question 3

Planar Sections

Answer 3

Tomography

stacked 2D images. CT/MRI

more detail, recombined into 3D representations

Standard Orientation
-Supine! Axial images, look from feet up

Question 4

Xray

Answer 4

radiolucent, thinner, less dense
-air soft tissue
radiopaque-lighter, thincker areas, less passes through
-bone, metals

Question 5

Contrast

Answer 5

radiopaque liquids added intravenously or swallowed or enema for contract. Xray or CT

Question 6

CT

Answer 6

based on xray, tomographic slicing with detector around object

Question 7

MRI

Answer 7

proton detector ina strong mag field

-similar tomography to CT

can be tuned for tissue type

moving fluids high in protons, bout move out of way without giving signal…appear black

Question 8

Ultrasound

Answer 8

no ionizing radiation, cheap protable.

detects reflection of high frequency sonic waves

Question 9

nuclear medicine

Answer 9

reuptake of radioisotopes in various systems or organs

my phsiologycal than anatomical

many radioparhaceuticals

can see blood flow in lunchs

projections or tomographic sections