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Purpose <p>Dedicated cardiac cameras tailored for myocardial perfusion imaging (MPI) have enabled faster procedures and increased patient flow. However, the lack of attenuation correction capabilities often requires dual-position imaging, potentially leading to increased occupational exposure. Our study evaluates the imaging duration and occupational exposure associated with conventional (NaI-based) gamma cameras compared to dedicated cardiac (CZT-based) cameras.</p> Methods <p>Patients scheduled for stress MPI randomly received either standard 333–407&#xa0;MBq (9–11&#xa0;mCi) or reduced activity 185–222&#xa0;MBq (5–6&#xa0;mCi) of <sup>99m</sup>Tc-sestamibi at peak stress. Those administered standard radiotracer activity were randomly assigned to undergo post-stress imaging on either a conventional NaI-based or a dedicated cardiac (CZT-based) camera. In contrast, patients who received reduced activity were exclusively imaged using the CZT-based camera. Consequently, the 264 study participants were divided into 3 groups: Group I (NaI standard activity), Group II (CZT standard activity) and Group III (CZT reduced activity). The average imaging duration and the mean radiation exposure for technologists in each group were calculated and compared.</p> Results <p>Group II (CZT standard activity) demonstrated a notably reduced imaging time (8.7 ± 1.87&#xa0;min) compared to Group I (15.6 ± 0.72&#xa0;min) and Group III (14.8 ± 3.85&#xa0;min). However, a significantly higher occupational exposure was observed in Group II, with an effective dose of ~ 0.769 µSv compared to Group I (0.163&#xa0;µSv) and Group III (0.224&#xa0;µSv). Additionally, there was no significant variance in imaging duration and occupational exposure between Group I and Group III.</p> Conclusion <p>The dedicated cardiac camera provides faster imaging than the conventional NaI-based camera with standard radiotracer activity but often requires dual-position imaging, which increases technologists’ radiation exposure.</p>

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Comparative analysis of occupational whole body effective dose and imaging time in myocardial perfusion imaging: dedicated cardiac CZT-SPECT versus conventional SPECT/CT

  • 期刊论文

  • 发表日期：

    2025年5月23日

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  • Ajay Kumar,
  • Harpreet Singh,
  • Kamalpreet Kaur,
  • Suraj Kumar,
  • Harsimran Kaur,
  • Bhagwant Rai Mittal

摘要

Purpose

Dedicated cardiac cameras tailored for myocardial perfusion imaging (MPI) have enabled faster procedures and increased patient flow. However, the lack of attenuation correction capabilities often requires dual-position imaging, potentially leading to increased occupational exposure. Our study evaluates the imaging duration and occupational exposure associated with conventional (NaI-based) gamma cameras compared to dedicated cardiac (CZT-based) cameras.

Methods

Patients scheduled for stress MPI randomly received either standard 333–407 MBq (9–11 mCi) or reduced activity 185–222 MBq (5–6 mCi) of 99mTc-sestamibi at peak stress. Those administered standard radiotracer activity were randomly assigned to undergo post-stress imaging on either a conventional NaI-based or a dedicated cardiac (CZT-based) camera. In contrast, patients who received reduced activity were exclusively imaged using the CZT-based camera. Consequently, the 264 study participants were divided into 3 groups: Group I (NaI standard activity), Group II (CZT standard activity) and Group III (CZT reduced activity). The average imaging duration and the mean radiation exposure for technologists in each group were calculated and compared.

Results

Group II (CZT standard activity) demonstrated a notably reduced imaging time (8.7 ± 1.87 min) compared to Group I (15.6 ± 0.72 min) and Group III (14.8 ± 3.85 min). However, a significantly higher occupational exposure was observed in Group II, with an effective dose of ~ 0.769 µSv compared to Group I (0.163 µSv) and Group III (0.224 µSv). Additionally, there was no significant variance in imaging duration and occupational exposure between Group I and Group III.

Conclusion

The dedicated cardiac camera provides faster imaging than the conventional NaI-based camera with standard radiotracer activity but often requires dual-position imaging, which increases technologists’ radiation exposure.