Comparison of bladder volume in prostate radiation therapy between simulation and treatment
Keywords:
Prostate cancer, bladder filling, uncertaintyAbstract
Background: Bladder filling uncertainties during prostate irradiation has direct effect on bladder dose.
Objective: To compare bladder volume between computed tomography (CT) simulation day and during radiotherapy.
Materials and Methods: The bladder volume of 9 prostate cancer patients who underwent irradiation with Varian TrueBEAM (Varian Medical System. Inc., Palo Alto, CA) at King Chulalongkorn Memorial Hospital were evaluated. Patients were required to empty their bladder before starting to record the bladder filling times. The time was recorded until treatment delivery. Patients had to drink 500 ml of water while waiting for the treatment. The dimension of bladder volume in width, length, and height was measured and calculated to bladder volume by using ellipsoid formula (width´length´height´0.52) on planning CT and daily Cone Beam Computed Tomography (CBCT) images by experience radiation technologists. The comparison of bladder volume was evaluated.
Results: The average time for bladder filling was 117.4 ± 3.7 minutes. The result showed that the bladder volume of CBCT on the treatment date was less than the bladder volume of planning CT significantly. The bladder volume was 455.3 ± 205.7 and 419.1 ± 197.5 cm3 for planning CT and CBCT, respectively.
Conclusion: The bladder volume for prostate cancer in the delivery process of radiotherapy was significantly less than on planning CT, which may be due to less amount of water or waiting time was not enough.
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