CH. 1 Medical Imaging Techniques & Misc.

Question 1

Microscopic Anatomy

Answer 1

Microscopy: examining small structures through a microscope
– Light microscopy illuminates tissue with a beam of light (lower magnification)
– Electron microscopy uses beams of electrons (higher magnification)

Scanning electron microscopy
– Provides three- dimensional pictures of whole, unsectioned surfaces

Artifacts
– Minor distortions of
preserved tissues
– Not exactly like living tissues and organs

Question 2

X-ray

Answer 2

Electromagnetic waves of very short length
– Best for visualizing bones and abnormal dense structures

Question 3

Computed (axial) Tomography (CT or CAT)

Answer 3

– Takes successive X-rays around a person’s full circumference
– Computer translates recorded information into a detailed picture of the body section

Question 4

Angiography

Answer 4

– Contrast medium highlights vessel structure
– Digital subtraction angiography (DSA)
▪ Images taken before and after contrast medium injection
▪ Computer subtracts “before” from “after” to identify blockage of arteries to heart wall and brain

Question 5

Advanced X-Ray Techniques

Answer 5

• Positron emission tomography (PET)—forms images by detecting radioactive isotopes injected into the body
• Sonography (ultrasound imaging)—body is probed with pulses of high-frequency sound waves that echo off the body’s tissues

Question 6

Magnetic Resonance Imaging (MRI)

Answer 6

• Produces high-contrast images of soft tissues
  – Distinguishes body tissues based on relative water content

Question 7

HUMAN BODY PLAN (ADD)