BioMed Research International

Research Article

Dosimetric and Radiobiological Comparison of Five Techniques for Postmastectomy Radiotherapy with Simultaneous Integrated Boost

Table 2

Summary of the dosimetric parameters, radiobiological indices, and delivery efficiency.
ParameterTDunb-HTb-HTff-IMRThy-IMRT
PTVboost
  (Gy)
  (Gy)
  (Gy)
  (%)
 CI
 HI
PTVtotal
  (Gy)
  (Gy)
  (Gy)
 
 hI
Lungs
  (%)
  (%)
 NTCP (‰)
 SCCP (%)
IL lung
  (%)
  (%)
  (Gy)
CL lung
  (%)
  (Gy)
Heart
  (%)
  (%)
  (%)
  (%)
  (Gy)
 NTCP (%)
CL breast
  (Gy)
 SCCP (%)
Spinal cord
  (Gy)
Delivery efficiency
 MU
 Time (s)
TD: TomoDirect; unb-HT: helical TomoTherapy without blocking structure; b-HT: helical TomoTherapy with blocking structure; ff-IMRT: fixed-field IMRT; hy-IMRT: hybrid IMRT. (Gy): dose absorbed by certain percentage (%) of the structure; (%): fractional volume exposed to certain radiation dose; IL lung: ipsilateral lung; CL lung: contralateral lung; CL breast: contralateral breast; similarly hereinafter.