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Nuclear Medicine Week 4 Questions and Answers (Latest Update 2025)
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Nuclear Medicine Week 4 Questions and Answers (Latest Update 2025)
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Nuclear Medicine Week 4 Questions andAnswers (Latest Update 2025)
What are gamma cameras? - Correct Answer ✅ Imaging
devices that we use to image the biodistribution of
radiopharmaceuticals - most are dual headed
What are collimators used for? - Correct Answer ✅ Restrict
gamma rays that contribute to an image
- thin pieces of lead with array of holes
- 0.01% actually reach the collimator
What are the types of collimators? - Correct Answer ✅ Pin
Hole
Parallel
Convering
Diverging
What is a parallel Hole Collimator? - Correct Answer ✅
Most Common Type
- holes are perpendicular to the detector
- true size of structure represented
- resolution best
,Nuclear Medicine Week 4 Questions and
Answers (Latest Update 2025)
- Low, Medium or High energy Collimators
What are pinhole collimators? - Correct Answer ✅ Thick
conical collimators with a single hole
- 2-5mm
- Magnify small structures, the closer to the patient the more
magnified
- usually used for low dose procedures
What are diverging and converging collimators? - Correct
Answer ✅ Diverging: array of tapered holes that diverge
from hypothetical focal point - used to image structures
larger than the detector
Converging: array of tapered holes that converge inwards to
focal point- magnified images (not as magnified as pinhole
What are scintillation detectors? - Correct Answer ✅ Pick
up the radiation that interacts with the crystal -(after
ionisation or excitation occurs) and releases energy as light
, Nuclear Medicine Week 4 Questions and
Answers (Latest Update 2025)
(most of energy dissipates as heat)
What are scintillating crystals? - Correct Answer ✅ -
inorganic substances which form solid crystal structures
- thallium-activate sodium or NaI (thallium is a doping
impurity that helps with scintillation events)
- naI crystals grown in oven
- aluminium jacket seals crystal so other light doesn't come in
and contribute to image
- transparent glass window allows scintillation light through to
PMT
What are the advantages of NaI (TI) scintillators? - Correct
Answer ✅ -relatively dense = good stopping power
- efficient detector
- relatively efficient (yield a visible light photon per 30eV of
rad absorbed)
- output signal is prop to amount of radiation energy
absorbed
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