Abstract
A bone scan procedure using radiopharmaceutical 99mTc-MDP (Methylenediphosphonate) is an examination to help establish diagnostics in detecting metastases (spread) of cancer cells to bone. The dose given in this examination was according to the instructions from the Europe Association of Nuclear Medicine (EANM), the average dose given was 500MBq and also based on the guidelines in the attachment to the Regulation of the Head of Bapeten No. 17 of 2012 was 700 MBq. Justification for giving this dose will undoubtedly affect the acceptance of the exposure dose by the patient himself. On the other hand, giving a minimal dose sometimes creates doubts and concerns about the final result or poor image quality. Fulfillment of this image quality can be seen or calculated using ratio assessment. The results of this ratio assessment will show good image quality if it meets the target to background ratio results, which is the accumulation in the primary and background objects > from 5:1. The result of the intensity ratio is obtained from the ROI (Region of Interest) in the lumbar spine divided by ROI (Region of Interest) in the non-bone (abdominal area), which is considered the background. Giving a low dose is expected so that the exposure dose is small, but the picture results are still fulfilled. Carried out the research by providing a dose of Bone scan examination based on the patient's body weight of 10 MBq/kg, then calculating the Target Background to Ratio on the results of scans in the lumbar region 1-5. Development of the research obtained the number of patients as many as 51 patients with three people removed from the study so that the number of patients who took data was 48 patients consisting of 38 women and ten men. The results of the calculation included 33 patients who met the ratio results (>5), while 15 patients still did not meet the image quality criteria (<5). The Conclusion of the ratio that meets the value >5 is 69%, and those who do not meet the requirements are 31%. Keywords: Bone Scan, Ratio Results, 99mTc MDP
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