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Table 4 Heart dose and target coverage with and without conformal shielding of the heart

From: Dosimetric consequences of the shift towards computed tomography guided target definition and planning for breast conserving radiotherapy

 

Heart

Breast PTVCT

 

Mean dose (Gy)

Volume ≥ 30 Gy (%)

Volume receiving ≥ 95% of prescribed dose (%)

 

3D-CRT

3D-CRT with shielded heart

3D-CRT

3D-CRT with shielded heart

3D-CRT

3D-CRT with shielded heart

Patient

      

1

4.8

2.0

5.1

0.0

98.9

93.8

2

2.9

2.1

1.4

0.0

98.9

97.5

3

3.4

2.0

2.5

0.0

99.1

90.3

  1. Dosimetric results with and without deliberate multileaf collimator shielding of the heart in the tangential breast beams. Results based on cumulative dose plans (breast plan 50 Gy + boost plan 16 Gy). Patients had upper-quadrant tumor sites. Boost PTVCT target coverage was not compromised.
  2. 3D-CRT: three-dimensional conformal radiation therapy; PTV: planning target volume; PTVCT: computed tomography (CT)-based PTV.
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Radiation Oncology

ISSN: 1748-717X

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