Comparative Dosimetric Analysis and Normal Tissue Complication Probability Modelling of Four-Dimensional Computed...

Area of Science:

• Oncology
• Radiotherapy
• Medical Imaging

Background:

• NeoSCOPE trial investigated neoadjuvant chemoradiotherapy for resectable esophageal cancer.
• It was the first UK multicenter trial using 4D-CT for radiotherapy planning.
• Evidence for 4D-CT benefits over 3D-CT in esophageal tumors remains limited.

Purpose of the Study:

• To compare dosimetric differences between 3D-CT and 4D-CT in radiotherapy planning for esophageal cancer.
• To evaluate potential toxicity reduction using 4D-CT plans based on normal tissue complication probability (NTCP) models.

Main Methods:

• Dosimetric comparison of 3D-CT versus 4D-CT plans using NeoSCOPE 4D-CT data.
• Assessment of target volume coverage and organ-at-risk doses.
• Application of NTCP models to predict toxicity outcomes.

Main Results:

• 4D-CT plans demonstrated a smaller median absolute planning target volume (PTV).
• Lower dose levels were observed for all reported constraints with 4D-CT.
• NTCP modeling indicated a significant relative risk reduction in cardiac and pulmonary toxicities with 4D-CT.

Conclusions:

• Incorporating 4D-CT into esophageal cancer treatment planning may substantially decrease treatment-related toxicity.
• 4D-CT offers dosimetric advantages and potential toxicity benefits over 3D-CT.