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Updated: May 3, 2026

Stereotactic Radiosurgery for Gynecologic Cancer

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Optical Surface Management System and BladderScan for Patient Setup During Radiotherapy of Postoperative Prostate

Hao Chen¹, Yandong Liu¹, Songbin Qin¹

¹Department of Radiation Oncology First Affiliated Hospital of Soochow University, Suzhou 215000, China.

Biomed Research International

|September 12, 2024

Summary

A new setup method combining Optical Surface Management System (OSMS) and BladderScan significantly improves patient setup accuracy in prostate cancer radiotherapy. This zero-dose technique enhances precision by better reproducing bladder volume, reducing errors compared to conventional methods.

Keywords:

BladderScan CBCT Dice similarity coefficient optical surface imaging real-time setup

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Focal Laser Ablation of Prostate Cancer: An Office Procedure

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Published on: March 30, 2021

Area of Science:

Radiation oncology
Medical physics
Prostate cancer treatment

Background:

Radiotherapy precision for prostate cancer is challenged by setup errors and bladder volume changes.
Daily cone beam computed tomography (CBCT) corrects setup errors but raises concerns about peripheral dose and workload.
A zero-dose, noninvasive method is needed to accurately reproduce bladder volume and improve patient setup.

Purpose of the Study:

To evaluate if combining Optical Surface Management System (OSMS) and BladderScan improves setup accuracy in postoperative prostate cancer radiotherapy.
To determine if this combined method accurately reproduces bladder volume.
To guide clinical target volume (CTV) to planning target volume (PTV) margins.

Main Methods:

A prospective study comparing a combined OSMS and BladderScan setup method (experimental group) with a conventional skin marker method (control group).
Setup errors (lateral, longitudinal, vertical, Pitch, Yaw, Roll) were analyzed using CBCT verification.
Bladder volume concordance was assessed using Dice Similarity Coefficient (DSC) and volume differences between CBCT and planning CT.

Main Results:

The experimental group showed significantly reduced setup errors in all directions (e.g., Vrt: 0.17 vs. 0.25 cm) and rotational errors (e.g., Pitch: 0.18° vs. 0.96°) compared to the control group (P < 0.01).
Bladder volume concordance was superior in the experimental group (DSC: 92.52% vs. 62.98%) with smaller volume differences (39.99 cm³ vs. 273.89 cm³).
All performance indicators demonstrated statistically significant improvements (P < 0.01).

Conclusions:

The combined OSMS and BladderScan setup method is validated by CBCT for improving accuracy in postoperative prostate cancer radiotherapy.
This technique offers enhanced setup precision compared to conventional methods.
The findings support the use of this method for optimizing radiotherapy delivery and margins.