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Peer-reviewedCC BY-NC 4.0Journal of Feline Medicine and Surgery

Positional impact on ocular lens and thyroid radiation doses during feline cranial CT: A thermoluminescent dosimetry study of 70 cases

  • Kurtuluş Parlak1
  • Osman Vefa Gül2
  • Hilmican Ergin1
  • Nuriza Zamirbekova Erdoğan1
  1. 1Department of Surgery, Faculty of Veterinary Medicine, Selcuk University, Konya, Turkey
  2. 2Medical Imaging Techniques Program, Vocational School of Health Services, Selcuk University, Konya, Turkey
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Abstract

Objectives:: The increasing use of CT in feline medicine necessitates the optimization of radiation protocols to adhere to the ALARA (as low as reasonably achievable) principle. This prospective study aimed to evaluate the impact of patient positioning (dorsoventral (DV) vs ventrodorsal (VD)) on radiation doses absorbed by the ocular lenses and thyroid gland during feline cranial CT.

Methods:: A total of 70 cats were divided into two equal groups (DV: n = 35, VD: n = 35). Radiation doses were measured using thermoluminescent dosimeters (TLD-100) placed at the anatomical projections of the target organs.

Results:: Although no statistically significant difference was observed in ocular lens doses between the groups (P >0.05), VD positioning resulted in a 24.4% reduction in mean radiation dose absorbed by the thyroid gland compared with the DV position (1.33 ± 0.17 mGy vs 1.76 ± 0.35 mGy, respectively; P = 4.97 ×10–9). This reduction is attributed to the “natural shielding” effect provided by the dorsal axial skeleton and epaxial muscles in the VD position.

Conclusions and relevance:: VD positioning offers a significant dosimetric advantage for protecting the thyroid gland without requiring additional equipment or compromising diagnostic quality. Adopting the VD position as a routine standard in feline cranial CT is recommended to minimize radiation exposure to the thyroid gland.

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Cite

BibTeXRIS
BibTeX
@article{parlak2026positional,
  title = {{Positional impact on ocular lens and thyroid radiation doses during feline cranial CT: A thermoluminescent dosimetry study of 70 cases}},
  author = {Kurtuluş Parlak and Osman Vefa Gül and Hilmican Ergin and Nuriza Zamirbekova Erdoğan},
  journal = {Journal of Feline Medicine and Surgery},
  year = {2026},
  month = aug,
  doi = {10.1177/1098612x261478797},
  url = {https://doi.org/10.1177/1098612x261478797},
  note = {CC BY-NC 4.0},
}
RIS
TY  - JOUR
TI  - Positional impact on ocular lens and thyroid radiation doses during feline cranial CT: A thermoluminescent dosimetry study of 70 cases
AU  - Kurtuluş Parlak
AU  - Osman Vefa Gül
AU  - Hilmican Ergin
AU  - Nuriza Zamirbekova Erdoğan
PY  - 2026
DA  - 2026/08/11
JO  - Journal of Feline Medicine and Surgery
DO  - 10.1177/1098612x261478797
UR  - https://doi.org/10.1177/1098612x261478797
AB  - Objectives:: The increasing use of CT in feline medicine necessitates the optimization of radiation protocols to adhere to the ALARA (as low as reasonably achievable) principle. This prospective study aimed to evaluate the impact of patient positioning (dorsoventral (DV) vs ventrodorsal (VD)) on radiation doses absorbed by the ocular lenses and thyroid gland during feline cranial CT.  Methods:: A total of 70 cats were divided into two equal groups (DV: n = 35, VD: n = 35). Radiation doses were measured using thermoluminescent dosimeters (TLD-100) placed at the anatomical projections of the target organs.  Results:: Although no statistically significant difference was observed in ocular lens doses between the groups (P >0.05), VD positioning resulted in a 24.4% reduction in mean radiation dose absorbed by the thyroid gland compared with the DV position (1.33 ± 0.17 mGy vs 1.76 ± 0.35 mGy, respectively; P = 4.97 ×10–9). This reduction is attributed to the “natural shielding” effect provided by the dorsal axial skeleton and epaxial muscles in the VD position.  Conclusions and relevance:: VD positioning offers a significant dosimetric advantage for protecting the thyroid gland without requiring additional equipment or compromising diagnostic quality. Adopting the VD position as a routine standard in feline cranial CT is recommended to minimize radiation exposure to the thyroid gland.
SN  - 1098-612X
SN  - 1532-2750
ER  -