Radiology I

Question 1

first instrument to produce X rays

Answer 1

cathode ray

Question 2

took first intramural radiograph

Answer 2

dr edmund kells - died because he was dumb and Xrayed his hand all day

Question 3

dr william coolidge

Answer 3

“hot cathode” - made tungsten ductile in filament. made shockproof.

Question 4

radiology/roentgenology

Answer 4

study or science of radiation as used in medicine and dentistry

Question 5

direct digital sensors

Answer 5

attached chord. interpreted by computer with vary shades of gray. instantaneous but some patients don’t like

Question 6

indirect digital sensors

Answer 6

photostimulable phosphor (PSP). no wires. plates produce latent image read by computer

Question 7

How are X-rays produced?

Answer 7

e’s produced at tungsten filament (cathode), go to tungsten target (anode) in copper and oil to reduce heat emission

Question 8

thermionic emission

Answer 8

describes boiling off of electrons

Question 9

focusing cup

Answer 9

negatively charged molybdenum that encases the cathode

Question 10

bremsstrahlung (breaking) radiation

Answer 10

types: 1. hits nucleus perfectly and 100% E transmission to photon 2. if not then electron and photon equal initial E of electron

Question 11

characteristic radiation

Answer 11

depends on interacting level of atom. k shell is closest so knockout electron here and get 69kEV. L shell knockout is around 60. E can’t exceed that shells binding energy

Question 12

kilovoltage controls what of xray

Answer 12

quality. high kV is more penetrating power

Question 13

mamps control what of xray

Answer 13

quality. moreelectons the darker the radiograph

Question 14

density

Answer 14

degree of blackness. controlled by mamas and tim. related to quality

Question 15

contrast controlled by what

Answer 15

kV. more shades of gray = less contrast. related to quality of x ray

Question 16

quality of X-ray related to what?

Answer 16

contrast, kV, mamps, density