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Annals of Nuclear Medicine

, Volume 30, Issue 4, pp 263–271 | Cite as

Simultaneous acquisition of 99mTc- and 123I-labeled radiotracers using a preclinical SPECT scanner with CZT detectors

  • Masato KobayashiEmail author
  • Ichiro Matsunari
  • Kodai Nishi
  • Asuka Mizutani
  • Yoshiharu Miyazaki
  • Kazuhiro Ogai
  • Jyunko Sugama
  • Kazuhiro Shiba
  • Keiichi Kawai
  • Seigo Kinuya
Original Article

Abstract

Objective

Simultaneous acquisition of 99mTc and 123I was evaluated using a preclinical SPECT scanner with cadmium zinc telluride (CZT)-based detectors.

Methods

10-ml cylindrical syringes contained about 37 MBq 99mTc-tetrofosmin (99mTc-TF) or 37 MBq 123I-15-(p-iodophenyl)-3R,S-methyl pentadecanoic acid (123I-BMIPP) were used to assess the relationship between these SPECT radioactive counts and radioactivity. Two 10-ml syringes contained 100 or 300 MBq 99mTc-TF and 100 MBq 123I-BMIPP to assess the influence of 99mTc upscatter and 123I downscatter, respectively. A rat-sized cylindrical phantom also contained both 100 or 300 MBq 99mTc-TF and 100 MBq 123I-BMIPP. The two 10-ml syringes and phantom were scanned using a pinhole collimator for rats. Myocardial infarction model rats were examined using 300 MBq 99mTc-TF and 100 MBq 123I-BMIPP. Two 1-ml syringes contained 105 MBq 99mTc-labeled hexamethylpropyleneamine oxime (99mTc-HMPAO) and 35 MBq 123I-labeled N-ω-fluoropropyl-2β-carbomethoxy-3β-(4-iodophenyl) nortropane (123I-FP-CIT). The two 1-ml syringes were scanned using a pinhole collimator for mice. Normal mice were examined using 105 MBq 99mTc-HMPAO and 35 MBq 123I-FP-CIT.

Results

The relationship between SPECT radioactive counts and radioactivity was excellent. Downscatter contamination of 123I-BMIPP exhibited fewer radioactive counts for 300 MBq 99mTc-TF without scatter correction (SC) in 125–150 keV. There was no upscatter contamination of 99mTc-TF in 150–175 keV. In the rat-sized phantom, the radioactive count ratio decreased to 4.0 % for 300 MBq 99mTc-TF without SC in 125–150 keV. In the rats, myocardial images and radioactive counts of 99mTc-TF with the dual tracer were identical to those of the 99mTc-TF single injection. Downscatter contamination of 123I-FP-CIT was 4.2 % without SC in 125–150 keV. In the first injection of 99mTc-HMPAO and second injection of 123I-FP-CIT, brain images and radioactive counts of 99mTc-HMPAO with the dual tracer in normal mice also were the similar to those of the 99mTc-HMPAO single injection. In the first injection of 123I-FP-CIT and second injection of 99mTc-HMPAO, the brain images and radioactive counts with the dual tracer were not much different from those of the 123I-FP-CIT single injection.

Conclusions

Dual-tracer imaging of 99mTc- and 123I-labeled radiotracers is feasible in a preclinical SPECT scanner with CZT detector. When higher radioactivity of 99mTc-labeled radiotracers relative to 123I-labeled radiotracers is applied, correction methods are not necessarily required for the quantification of 99mTc- and 123I-labeled radiotracers when using a preclinical SPECT scanner with CZT detector.

Keywords

Dual tracer 99mTc 123Small animal SPECT scanner Cadmium zinc telluride 

Notes

Acknowledgments

The author would like to thank Akiko Hayashi and Ryoko Komatsu, Takafumi Tsujiuchi, Masatoshi Sakashita and members of the medical staff at the Ishikawa prefectural government and Kanazawa University.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Sources of funding

This study was partly funded by Grants-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (24601008, 24659558, 25293260 and 15K09949), the Society of Nuclear Medicine Technology, Japanese Society of Radiological Technology and Ishikawa Prefecture Commission Research.

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Copyright information

© The Japanese Society of Nuclear Medicine 2016

Authors and Affiliations

  • Masato Kobayashi
    • 1
    Email author
  • Ichiro Matsunari
    • 2
    • 3
  • Kodai Nishi
    • 4
  • Asuka Mizutani
    • 5
  • Yoshiharu Miyazaki
    • 2
  • Kazuhiro Ogai
    • 1
  • Jyunko Sugama
    • 1
  • Kazuhiro Shiba
    • 6
  • Keiichi Kawai
    • 7
  • Seigo Kinuya
    • 8
  1. 1.Wellness Promotion Science Center, Institute of Medical, Pharmaceutical and Health SciencesKanazawa UniversityKanazawaJapan
  2. 2.Clinical Research DepartmentThe Medical and Pharmacological Research Center FoundationHakuiJapan
  3. 3.Division of Nuclear Medicine, Department of RadiologySaitama Medical University HospitalSaitamaJapan
  4. 4.Department of Radioisotope Medicine, Atomic Bomb Disease InstituteNagasaki UniversityNagasakiJapan
  5. 5.Graduate School of Medicine, Division of Health SciencesOsaka UniversityOsakaJapan
  6. 6.Division of Tracer Kinetics, Advanced Science Research CenterKanazawa UniversityKanazawaJapan
  7. 7.School of Health Sciences, College of Medical, Pharmaceutical and Health SciencesKanazawa UniversityKanazawaJapan
  8. 8.School of Medical Sciences, College of Medical, Pharmaceutical and Health SciencesKanazawa UniversityKanazawaJapan

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