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The structural failure of a multi-hole collimator.

A M Harris¹, R J Ward

¹Department of Medical Physics and Clinical Engineering, Royal Devon and Exeter Hospital (Wonford), UK. nuclear.medicine@virgin.net

Nuclear Medicine Communications

|November 7, 2000

Summary

A detached collimator honeycomb in gamma cameras can affect image quality and damage equipment. Updated quality assurance now includes visual checks of collimator cores to prevent such issues.

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Area of Science:

Medical Imaging
Nuclear Medicine Technology

Background:

Gamma cameras are crucial for nuclear medicine imaging.
Extrinsic spatial resolution is a key performance metric for gamma cameras.

Purpose of the Study:

To investigate the cause of observed variations in extrinsic spatial resolution.
To identify potential risks to patient imaging and equipment.

Main Methods:

Measurements of extrinsic spatial resolution across the gamma camera's field of view.
Inspection of the collimator's parallel hole structure.
Examination of the collimator honeycomb integrity.

Main Results:

Variations in spatial resolution were found to be position-dependent.

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The collimator honeycomb was discovered to be detached from its surround.

The detachment posed risks to patient investigation quality and potential crystal damage.

Conclusions:

Collimator integrity is critical for accurate gamma camera performance.
The incident led to enhanced quality assurance procedures.
A visual check of collimator cores is now mandatory for all gamma cameras.