ESTRO 2024 - Abstract Book

S2315

Clinical - Urology

ESTRO 2024

372

Digital Poster

Effects of hydration on consistency of bladder-filling protocol during pelvic radiation therapy

Amna Abdullah Al Ajmi, Abishek Vidhyadharan, Mohammad khalifa Al Gafri, Nadeem Pervez, Iqbal Al Amri, Zahid Al Mandhari, Agha Muhammed Hammad, Mohsina Vallengara

Sultan Qaboos comprehensive cancer care and Research center, Radiation Therapy, Muscat, Oman

Purpose/Objective:

Hydration helps in maintaining a consistent bladder volume throughout treatment of pelvic Radiotherapy which therefore, will reduce organs motion and reduce side effects. This study aims to establish a concise and reproducible protocol for maintaining bladder volume through hydration during radiation therapy in pelvic cancer patients

Material/Methods:

Twenty-four consecutive pelvic cancer patients treated at our institute were retrospectively analysed for bladder filling. Patients were divided into two groups based on preparation of bladder filling protocol. After emptying the bladder, Group one drank 750 ml of water and waited duration of 45 minutes before scan. Group two drank 250 ml of water for hydration, and then 15 minutes later, voided bladder. The patient next consumed 500 ml of water and waited 30 minutes before scan. In order to assess the consistency, bladder volume on daily cone-Beam computed tomography (CBCT) images of the patient on treatment days was contoured by therapist ,reviewed and modified by physician and then compared with CT-sim

Results:

A total of 601 CBCT images were contoured and analysed retrospectively. All data were carefully reviewed and recorded on an Excel sheet. The average of the standard-deviation of bladder volume was found to be 83.81, 66.65 for Group1 & Group2 respectively. whereas the average of volume difference from the CT-sim to the CBCT was found to be -37.57 ml, 8.03 ml for Group1 & Group2 respectively

Conclusion:

The hydration had a good impact on maintaining a consistent bladder volume as the result suggests that standard deviation is more in Group1 than the Group2 in our study which indicates that Group2 offers a bladder filling protocol that is better reproducible throughout the Treatment. A prospective study is being considered to confirm the findings and provide more comprehensive evidence on the effectiveness of these interventions