3189 - Innovative Application Value of Personalized Lumbar Support Pillows Combined with Image-Guided Technology in Precision Radiotherapy for Pelvic Tumors

12:30pm - 01:45pm ET

Poster Hall - Exhibit Hall A

Screen: 14

POSTER

Presenter(s)

Fa Yang, - Department of Radiation Oncology, Xijing Hospital, Fourth Military Medical University., xi'an, shaanxi

F. T. Yang¹, F. Bai², and L. N. Zhao³; ¹Department of Radiation Oncology, Xijing Hospital, Fourth Military Medical University., xi'an, shaanxi, China, ²Department of Radiation Oncology, Xijing Hospital, Fourth Military Medical University, xi'an, Shaanxi, China, ³Department of Radiation Oncology, First Affiliated Hospital of Air Force Medical University, Xi'an, China

Purpose/Objective(s):

This study aims to investigate the application value of personalized lumbar support cushions combined with image-guided technology in radical radiotherapy for pelvic tumors. Through comparative analysis, it verifies their synergistic effects in reducing positioning errors, optimizing dose distribution, and advancing precision radiotherapy practices.

Materials/Methods:

A total of 97 patients undergoing radical radiotherapy for pelvic tumors admitted to our department were enrolled. They were divided into an experimental group (customized lumbar support combined with image-guided technology) and a control group (image-guided technology alone). The customized support was fabricated using medical-grade polymer materials via 3D printing to ensure perfect alignment with the patient's lumbosacral physiological curvature. The control group utilized conventional positioning fixation. All patients underwent cone-beam computed tomography (CBCT) scans before the initial treatment and weekly thereafter. Positioning errors were measured and recorded in three directions: lateral (X-axis), head-to-foot (Y-axis), and anterior-posterior (Z-axis), followed by comparative analysis. Concurrently, dose distribution differences in the target area and critical organs (bladder, rectum, small intestine) were evaluated.

Results:

A total of 97 patients were included in this study (48 in the experimental group and 49 in the control group). The experimental group exhibited positioning errors of (1.42±0.85) mm, (1.58±0.92) mm, and (1.35±0.78) mm along the X, Y, and Z axes, respectively, significantly better than the control group's values of (2.65±1.31) mm, (2.83±1.46) mm, and (2.71 ± 1.25) mm, respectively (P < 0.05). Dosimetric analysis revealed a reduction in rectal Dmean by (3.6 ± 0.8) Gy and a decrease in V45 by (12.5 ± 3.2) cc; bladder Dmean decreased by (3.1 ± 0.7) Gy and V40 decreased by (10.8 ± 2.9) cc; and small bowel V45 decreased by (8.7±2.1) cc. The high-dose-irradiated volume significantly decreased in all cases (P<0.05).

Conclusion:

The personalized lumbar support cushion, achieved through 3D printing technology for precise customization, significantly enhances the stability of patient positioning and effectively reduces positioning errors in all directions. Its combined application with image-guided technology produces synergistic effects. While ensuring adequate dose coverage to the target area, it substantially reduces radiation exposure to critical organs. This approach offers both practicality and scalability for precision radiotherapy in pelvic tumors, warranting widespread clinical adoption.