Volumetric and dosimetric effects of different slice thickness in radiotherapy planning Computed Tomography for head and Neck cancer

  • J Fazilathunnisa Intern, Medical Physicist, Department of Radiation Oncology, SRMS Institute of Medical Sciences, Bareilly, UP, India
  • S Navitha Medical Physicist, Department of Radiation Oncology, SRMS Institute of Medical Sciences, Bareilly, UP, India
  • Jitendra Nigam Medical Physicist, Department of Radiation Oncology, SRMS Institute of Medical Sciences, Bareilly, UP, India
  • NS Silambarasan Medical Physicist, Department of Radiation Oncology, SRMS Institute of Medical Sciences, Bareilly, UP, India
  • Piyush Kumar Professor & Head, Department of Radiation Oncology, SRMS Institute of Medical Sciences, Bareilly, UP, India
Keywords: Radiotherapy, IMRT, Head and Neck cancer, Slice thickness, Small volume organs

Abstract

Introduction: Accurate estimation of target and Organ at Risk Volume is required to ensuretreatment efficacy and minimal normal tissue toxicity in radiotherapy planning. ComputedTomography slice thickness plays a vital role in volume estimation. It highly impacts smaller volumeorgans such as 1-3cm3.

Materials and Methods: CT datasets of 20 head and neck cancer patientswere recruited for this study in each CT data three CT series with a slice thickness of 1.5mm, 3mmand 5mm were imported to the TPS. Eclipse TPS of version 13.6 was used for delineation andtreatment planning.

Results: The variability of volumes with CT slice thickness was significant,especially for small volume structures. The maximum volume error of 63% was found in >3ccvolume structures with 5mm slice thickness. Whereas in larger volume structures the differenceswere observed 2%in terms of volume and mean dose. And in terms of homogeneity and conformity,there is no significant difference was found.

Conclusion: This study concludes that for head andneck cancer which has many smaller volume structures 1.5mm slice thickness will accuratelyestimate the volume which is clinically useful for OAR near the PTV.

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How to Cite
1.
J Fazilathunnisa, S Navitha, Jitendra Nigam, NS Silambarasan, Piyush Kumar. Volumetric and dosimetric effects of different slice thickness in radiotherapy planning Computed Tomography for head and Neck cancer. Int J Med Res Rev [Internet]. 2022Apr.2 [cited 2022May25];10(2):57-2. Available from: https://ijmrr.medresearch.in/index.php/ijmrr/article/view/1362
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Original Article