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Updated: Jun 16, 2026

Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies

Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies

Published on: February 6, 2019

A case study in proton pencil-beam scanning delivery.

Hanne M Kooy¹, Benjamin M Clasie, Hsiao-Ming Lu

¹F. H. Burr Proton Therapy Center, Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114, USA. hkooy@partners.org

International Journal of Radiation Oncology, Biology, Physics

|February 2, 2010

Summary

Pencil-beam scanning (PBS) offers improved radiotherapy for bulky tumors by simplifying treatment planning and reducing costs. This proton therapy technique enhances dose distribution and treatment efficiency.

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Area of Science:

Radiation Oncology
Medical Physics
Proton Therapy

Background:

Radiotherapy aims to maximize dose to tumors while sparing healthy tissues.
Pencil-beam scanning (PBS) is an advanced radiotherapy technique using focused proton beams.
Treating bulky tumors presents challenges in dose delivery and target coverage.

Observation:

A novel implementation of PBS utilized broad pencil-beams (20-35 mm FWHM) for treating a large retroperitoneal sarcoma (4,295 cc).
The patient received a combined photon and proton therapy course, followed by a proton-only course.
Dosimetric data were collected and compared across treatment phases.

Findings:

PBS implementation for bulky targets simplifies treatment planning and delivery compared to traditional proton fields.
The system demonstrated improved dose distributions and reduced overall treatment time.
This approach obviates the need for costly, field-specific hardware construction.

Implications:

PBS represents a cost-effective and efficient method for treating complex, bulky tumors with proton therapy.
The technology enhances the therapeutic ratio in radiation oncology.
This case study highlights the clinical utility of PBS in improving patient outcomes and reducing treatment burdens.