Year: 2025 | Month: December | Volume: 12 | Issue: 12 | Pages: 903-906
DOI: https://doi.org/10.52403/ijrr.20251290
Assessment of Diagnostic Reference Levels for Dual Bed-Position CT Acquisition in Tc-99m MDP SPECT/CT
Mutiarani Novanti Wibisono1, Wahyu Setia Budi1, Ngurah Ayu Ketut Umiati1, Rini Sintawati2, Raras Hanifatunnisa2
1Department of Physics, Faculty of Science and Mathematics, Universitas Diponegoro, Semarang, Indonesia,
2Department of Nuclear Medicine and Molecular Theranostics, Dr. Hasan Sadikin General Hospital, Bandung, Indonesia,
Corresponding Author: Mutiarani Novanti Wibisono
ABSTRACT
The radiopharmaceutical Tc-99m MDP is currently used for bone scans. This examination uses whole-body scans of SPECT/CT to detect bone metastatic and diagnostic. The patient will receive the amount of radiation exposure that is affected by the variations in acquisition parameters. Therefore, determining the DRL is necessary to ensure the dose used is within the optimal limit and in accordance with clinical practice. This study aims to determine the local DRL value for the CT modality in double-bed position SPECT/CT examinations. This study was conducted retrospectively by collecting data on CTDIvol, DLP, and scan length (SL) from patients who were undergoing examinations at Hasan Sadikin General Hospital. The DRL value for the double-bed position was calculated using the 75th percentile of the DLP distribution. The results showed that the use of a double-bed position protocol yields a DLP value twice that of the single-bed position protocol. Confirming that the increase in CT dose is greatly influenced by the contribution of increasing the number of bed positions. These findings indicate the need for protocol standardization and periodic DRL evaluation.
Keywords: DLP, DRL, Double–bed, Bone scan, Tc-99m MDP
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