introduction to diagnostic imaging

Question 1

what device does radiology usually use

Answer 1

x ray

Question 2

how many percent and milisielvert per year does man made and natural radiation have

Answer 2

man made has 0.6 mils and 15-30 percen

natural has 2.4 mils and 70-85 percen

Question 3

how many percentage of diagnostic imainging modality does ct scan contrubute

Answer 3

4

Question 4

what are the hazards of radiation exposure

Answer 4

carcinogenesis
teratogenesis
abortion
burn

Question 5

absorption of too much radioactive iodine can cause

Answer 5

thyroid cancer

Question 6

radiation emitting modalities

Answer 6

radiographs 
mammographs
ct scan 
nuclear medicine imaging
fluoroscopy

Question 7

non radiation emitting modalities

Answer 7

ultrasound

mri…. magnetic resonance image

Question 8

modes of imaging

Answer 8

anatomical
functional
combined

Question 9

what imaging method is the most readily available

Answer 9

radiography

Question 10

radiography detects

Answer 10

fractures
pneumonia
intestinal obstruction

Question 11

what substance is the darkest on the radiograph

Answer 11

air

Question 12

which device is usually the whitest on the radiography

Answer 12

metal

Question 13

what are the five radiographic densities

Answer 13

air 
metal 
fat 
bone 
soft tissue

Question 14

plain radiography being the initial assessment for the paintent … what type of diseases are obtained by plain radiographs

Answer 14

rheumatoid arthritis
pneumonia
fractures
brain tumors

Question 15

disadvantages of the conventional radiography

Answer 15

the diagnostic accuracy is limited

other imaging test maybe more safe and faster

Question 16

uses of the ct scan

Answer 16

provides better differentiation between various soft tissues

preferred over x ray for head , cranial ,thoracic evaluations

three dimensional images helps surgeons plan for surgery

Question 17

what does mri use to produce tomography

Answer 17

magnetic fields and radio waves

Question 18

uses of mri

Answer 18

preferred over ct scan when the contrast resolution must be highly detailed

Question 19

what oragns does the ultrasound evaluate

Answer 19

heart
gall bladder
urinary tract 
female reproductive organs 
pregnancy
musculoskeletal

Question 20

disadvantages of ultrasound

Answer 20

its difficult to obtain a clear image when the patient is obese
cant be used for bones and gas
quality of image depends on the operator