Intro to imaging

Question 1

what is an x-ray

Answer 1

an electromagnetic packet of energy with a extremely short wavelength 0.1 to 10nm

Question 2

3 interactions x-rays have with matter

Answer 2

deflection
absorption
transmission

Question 3

what does attenuation mean?

Answer 3

process by which radiation loses power as it travels through matter and interacts with it

Question 4

what does attenuation increase with

Answer 4

density
thickness
atomic number

Question 5

air and x-ray

Answer 5

x-ray is transmitted through air

hence why it shows up black on scan

Question 6

x-ray and bone

Answer 6

cannot be transmitted through bone due to density and thickness
white on a scan

Question 7

ultrasound

Answer 7

high frequency sound pulses
sound waves travel into body reflected waves picked up by probe

machine displays the distances and intensities of the echoes on the screen, forming a two dimensional image

Question 8

CT

Answer 8

rotating x-ray tube
multiple beams
single axis of rotation
iodine contrast often - can lead to kidney failure

Question 9

alpha particles penetration ability

Answer 9

can’t go through paper

Question 10

beta particle- penetration ability

Answer 10

can go though paper but not hand

Question 11

x or gamma rays penetration ability

Answer 11

not through concrete

Question 12

sievert

Answer 12

unit used to describe absorption of radiation by the human body