CT Extended Hounsfield Unit Range in Radiotherapy Treatment Planning for Patients with Implantable Medical Devices
| Autor: | Sima Qamhiyeh, Gregor Schaefers, Zehra Ese, Waldemar Zylka, Daniel Erni, Jakob Kreutner |
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| Rok vydání: | 2018 |
| Předmět: |
Dose calculation
medicine.diagnostic_test business.industry Computed tomography Radiotherapy treatment planning Imaging phantom 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine 030220 oncology & carcinogenesis Hounsfield scale Metallic materials Range (statistics) Medicine business Radiation treatment planning Nuclear medicine Elektrotechnik |
| Zdroj: | IFMBE Proceedings ISBN: 9789811090226 |
| Popis: | Radiotherapy (RT) treatment planning is based on computed tomography (CT) images and traditionally uses the conventional Hounsfield unit (CHU) range. This HU range is suited for human tissue but inappropriate for metallic materials. To guarantee safety of patient carrying implants precise HU quantification is beneficial for accurate dose calculations in planning software. Some modern CT systems offer an extended HU range (EHU). This study focuses the suitability of these two HU ranges for the quantification of metallic components of active implantable medical devices (AIMD). CT acquisitions of various metallic and non-metallic materials aligned in a water phantom were investigated. From our acquisitions we calculated that materials with mass-density ρ > 3.0 g/cm3 cannot be represented in the CHU range. For these materials the EHU range could be used for accurate HU quantification. Since the EHU range does not effect the HU values for materials ρ < 3.0 g/cm3, it can be used as a standard for RT treatment planning for patient with and without implants. |
| Databáze: | OpenAIRE |
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