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Gamma Camera Structure and Function Quiz

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Questions and Answers

What is the function of the multi-hole collimator in the gamma camera?

To eliminate all photons except for scattered photons traveling obliquely to the axes of the apertures
To select only unscattered photons traveling in a direction parallel to the axes of the apertures (correct)
To select only scattered photons traveling in a direction parallel to the axes of the apertures
To allow only scattered photons to reach the PMT array

What happens to undesirable events involving scattered and unscattered photons traveling obliquely to the axes of the apertures?

They are eliminated by attenuation by one or more collimator septa (correct)
They are converted into desirable events by the position logic circuits
They are eliminated by energy discrimination within the patient
They are allowed to pass through and reach the PMT array

What is the main purpose of the gamma camera?

To select only the radiation coming and hitting the collimator perpendicularly (correct)
To yield mispositioned counts from scattered photons
To allow all types of radiation to pass through and reach the PMT array
To permit all undesirable events to reach the position logic circuits

What is the role of Compton scatter in undesirable events related to scattering within the patient?

Compton scatter yields mispositioned counts when not eliminated (D) Signup and view all the answers

What is the main purpose of tomographic imaging?

To digitally stack several successive slices to form a three-dimensional image (B) Signup and view all the answers

How are SPECT images beneficial in hybrid imaging?

For increased specificity and accurate depiction of disease localization (A) Signup and view all the answers

What is the resolution of SPECT systems?

About 1cm (C) Signup and view all the answers

How do tomographic images differ from conventional imaging?

Tomographic images provide more detailed information, while conventional imaging does not (D) Signup and view all the answers

What does SPECT/CT hybrid imaging help correct?

Soft tissue from imaging (C) Signup and view all the answers

What allows for rearrangement of the reconstructed 3D array at any angle relative to the patient's axis?

Reconstructed 3D images being contiguous with no inter-section gaps (B) Signup and view all the answers

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