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GEOFFREY IBBOTT RADIOLOGICAL PHYSICS CENTER HOUSTON, TEXAS
Target Margin Display
Target Margins
Proxim al Distal
Do we need Proton Therapy? GEOFFREY IBBOTT RADIOLOGICAL PHYSICS - - PowerPoint PPT Presentation
Do we need Proton Therapy? GEOFFREY IBBOTT RADIOLOGICAL PHYSICS - - PowerPoint PPT Presentation
Do we need Proton Therapy? GEOFFREY IBBOTT RADIOLOGICAL PHYSICS CENTER HOUSTON, TEXAS Target Margin Display Distal Target Margins Proxim al Dose Profile Showing Modulated Depth Dosimetry and Calibration Standards Disagreement on width
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Dose Profile Showing Modulated Depth
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Dosimetry and Calibration Standards
Disagreement on
width of SOBP
Disagreement on
procedure to convert CT# to stopping power
General, but not
universal, agreement to use TRS-398
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Promising research/ development areas
- 1. Delivery systems with selectable energy, scanning
- 2. Standards for measurement, prescription and
reporting of dose
- 3. IMPT
- 4. Adaptive treatment for moving targets
- 5. Therapeutic effectiveness to be demonstrated
- 6. Adopt high-LET radiation
Jakel et. al., (2008) The future of heavy ion radiotherapy. Med. Phys. 35, 5653
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Proton Pelvis Phantom
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Phantom Treatment
Treatment plan created
with a prescription of 6 Gy to the prostate
Plan delivered 3 times
with film and TLD inserted in phantom
Plan accounting for
difference in patient and material SP to be delivered in near future
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TLD results
PTV Right PTV Left Femur Right Femur Left Institution Predicted Dose (cGy)
600.2 600.2 247.3 243.8
TLD Measured Dose (cGy)
589.8 595.1 242.1 240.4
Measured / Predicted Dose
0.983 0.992 0.979 0.986
PTV within 1.7% of predicted value Femur within 2.1% of predicted value
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