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Annals of Nuclear Medicine

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01-04-2013 | Original Article

Appropriate collimators in a small animal SPECT scanner with CZT detector

Authors: Yusuke Higaki, Masato Kobayashi, Tomoya Uehara, Hirofumi Hanaoka, Yasushi Arano, Keiichi Kawai

Published in: Annals of Nuclear Medicine | Issue 3/2013

Abstract

Objective

Almost all small animal SPECT is performed with pinhole collimators (PH), including single-PH (SPH) and multi-PH (MPH). In the clinical study, not only PH but also parallel-hole collimator (PAH) is often used in planar and SPECT imaging. However, there have been no comparative studies on image quality with various collimators on the small animal imaging. This study compared the basic characteristics of PH and PAH in small animal imaging.

Methods

Performance of planar and SPECT images was evaluated using ^99mTcO₄ ⁻ and SPH, MPH and PAH with low energy and high resolution on the SPECT/CT scanner FX3200. We measured sensitivity, resolution, concentration linearity and uniformity. Planar imaging of mice with ^99mTc-labeled mercaptoacetyltriglycine (^99mTc-MAG₃) was performed using SPH and PAH. SPECT imaging with ^99mTc-methylene diphosphonate (^99mTc-MDP) was performed using all collimators.

Results

With SPH, MPH and PAH, sensitivity was 43.5, 211.2 and 926.5 cps/MBq, respectively, and spatial resolution was 0.60/0.56, non/0.96, 5.20/5.34 mm full-width half maximum (planar/SPECT), respectively. There were marked correlations between the radioactivity counts on images and radioactivity with all collimators. Values of % standard deviation on planar imaging showed small differences between the SPH and PAH, while the values were the smallest on SPECT imaging with MPH. On imaging of mice, SPH yielded high-quality ^99mTc-MAG₃-planar images when compared with PAH. MPH yielded sharper ^99mTc-MDP-SPECT images than SPH and PAH.

Conclusions

The characteristics of PH and PAH differed on small animal imaging. Although sensitivity was higher with PAH, PH showed higher resolution. Among the PH collimators, SPH was more appropriate for planar imaging, and MPH was more suitable for SPECT imaging in a small animal imaging scanner with CZT detector.

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Title: Appropriate collimators in a small animal SPECT scanner with CZT detector
Authors: Yusuke Higaki
Masato Kobayashi
Tomoya Uehara
Hirofumi Hanaoka
Yasushi Arano
Keiichi Kawai
Publication date: 01-04-2013
Publisher: Springer Japan
Published in: Annals of Nuclear Medicine / Issue 3/2013
Print ISSN: 0914-7187
Electronic ISSN: 1864-6433
DOI: https://doi.org/10.1007/s12149-012-0681-5

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Appropriate collimators in a small animal SPECT scanner with CZT detector

Abstract

Objective

Methods

Results

Conclusions

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Objective

Methods

Results

Conclusions

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