radiology

Question 1

what are xrays made from

Answer 1

inner shell electrons

Question 2

attenuation

Answer 2

xrays loosing power as they travel through a material

Question 3

attenuation increases with

Answer 3

atomic no.

density

thickness

makes more opaque

Question 4

cancers NOT scanned with MRI

Answer 4

lung

GI

testis

lymphoma

melanoma

Question 5

cancers NOT scanned by CT

Answer 5

lymphoma in CNS/MSK

spinal chord

Question 6

cancers diagnosed with PET

Answer 6

lung

GI

rectum/anal

bladder

lymphoma

melanoma

Question 7

pre biopsy MRI is used on

Answer 7

prostate cancer

Question 8

what does barium do

Answer 8

increases atomic number

absorbs lots of Xrays- appears opaque

Question 9

cancer: barium swallow and meal is used to investigate

Answer 9

oesophagus, stomach and duodenum

Question 10

cancer: barium enema is used to investigate

Answer 10

large bowel

Question 11

molecular imaging uses

Answer 11

gamma emitting drug given to patient which the machine reads

Question 12

isotope used should have

Answer 12

½ life not much longer or less than the length of the scan

emits gamma waves

50-300 KeU energy

readily available

can be bound to a pharmaceutical component

Question 13

example isotope

Answer 13

^99mTechnicium

Question 14

radionucleotide imaging

Answer 14

gamma waves from patient is read by sodium imaging crystal and colimeter

Question 15

SPECT

Answer 15

CT version where gamma camera rotates around patient

Question 16

PET

Answer 16

positron emission tomography

uses radionucleotide’s instead of gamma

radionucleotides decay and emit positrons