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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.