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Translational Rabbit Model of Chronic Cardiac Pacing

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SU-E-T-265: Reducing Pacemaker Doses with a Lead Sheet: A Multi-Detector Study.

A Bourgouin^1,2,3, N Varfalvy^1,2,3, L Beaulieu^1,2,3

¹CHUQ Pavillon Hotel-Dieu de Quebec, Québec, Québec.

Medical Physics

|May 19, 2017

Summary

This summary is machine-generated.

Lead shielding can effectively reduce radiation dose to pacemakers during antero-posterior radiotherapy. However, its use is not advised for postero-anterior fields, and placement outside the radiation field is crucial for optimal benefit.

Keywords:

Error analysis Ionization chambers Photons Position sensitive detectors Scintillation detectors

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Area of Science:

Medical Physics
Radiation Oncology
Radiotherapy Dosimetry

Background:

Pacemakers are sensitive to radiation, necessitating dose reduction strategies during radiotherapy.
Lead shielding is a potential method for mitigating radiation exposure to implanted medical devices.

Purpose of the Study:

To evaluate the efficacy and safety of lead shielding for reducing radiation dose to pacemakers.
To assess the impact of lead shielding placement and beam energy on dose reduction.

Main Methods:

Measurements were conducted using a solid water phantom at 0.5 cm depth with 6 MV and 23 MV photon beams.
Dosimetry was performed using a parallel plate ion chamber and a plastic scintillation detector (PSD) prototype.
Lead shielding (1.6 mm) was tested with various field sizes and positions relative to the phantom.

Main Results:

Both detectors showed excellent agreement (0.6%) across all measurements.
Antero-posterior fields at 23 MV showed the greatest dose reduction (65%) with shielding outside the field.
Shielding inside the field increased the dose for both antero-posterior and postero-anterior beams; benefits diminished beyond 35 cm from the field edge.

Conclusions:

Lead shielding is recommended for antero-posterior radiotherapy to decrease pacemaker dose.
For postero-anterior fields, lead shielding should be avoided or placed outside the treatment field.
Plastic scintillation detectors (PSD) are suitable for in vivo monitoring of radiation dose to pacemakers and other sensitive sites like fetuses.