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Journal of Nuclear Medicine Technology

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Instrumentation

Foil Collimator Defects: A Comparison with Cast Collimators

Michael J. Blend, Bhupendra A. Patel, Darius Rubas, Carlos Bekerman and Ernest Byrom
Journal of Nuclear Medicine Technology March 1992, 20 (1) 18-22;
Michael J. Blend
Humana Hospital-Michael Reese, Chicago, Illinois and The Evanston Hospital, Evanston, Illinois
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Bhupendra A. Patel
Humana Hospital-Michael Reese, Chicago, Illinois and The Evanston Hospital, Evanston, Illinois
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Darius Rubas
Humana Hospital-Michael Reese, Chicago, Illinois and The Evanston Hospital, Evanston, Illinois
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Carlos Bekerman
Humana Hospital-Michael Reese, Chicago, Illinois and The Evanston Hospital, Evanston, Illinois
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Ernest Byrom
Humana Hospital-Michael Reese, Chicago, Illinois and The Evanston Hospital, Evanston, Illinois
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Abstract

Imperfections such as septal tears, improper alignment of channels, and improper seating can be built into collimators at the time of manufacture. The purpose of this study was to compare the collimator uniformity of a high-resolution low-energy foil collimator to that of a similar cast collimator. A 5 mCi point source of technetium-99m (99mTc) placed 5 m from the collimator face was imaged with both collimators. Line sources were imaged at 5 to 30 cm from the collimator face, both above and below the imaging table. A SPECT phantom filled with 10 mCi of 99mTc was imaged with both collimators. Transaxial images were reconstructed, and uniformity corrections were obtained, based on data from each collimator. In the distant point-source images, using the foil collimator, linear streaks and a sizeable cold defect were seen. These almost disappeared in the sheet-source images. Linear streaks were also present in the line-source images. The SPECT images showed small ring artifacts in three areas. None of these defects were seen with the cast collimator. These findings illustrate the importance of properly evaluating the uniformity of each collimator purchased with a new system.

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Journal of Nuclear Medicine Technology: 20 (1)
Journal of Nuclear Medicine Technology
Vol. 20, Issue 1
March 1, 1992
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Foil Collimator Defects: A Comparison with Cast Collimators
Michael J. Blend, Bhupendra A. Patel, Darius Rubas, Carlos Bekerman, Ernest Byrom
Journal of Nuclear Medicine Technology Mar 1992, 20 (1) 18-22;

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Foil Collimator Defects: A Comparison with Cast Collimators
Michael J. Blend, Bhupendra A. Patel, Darius Rubas, Carlos Bekerman, Ernest Byrom
Journal of Nuclear Medicine Technology Mar 1992, 20 (1) 18-22;
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