TY - CHAP A1 - Ese, Zehra A1 - Qamhiyeh, Sima A1 - Kreutner, Jakob A1 - Schaefers, Gregor A1 - Erni, Daniel A1 - Zylka, Waldemar ED - Lhotska, Lenka ED - Sukupova, Lucie ED - Lacković, Igor ED - Ibbott, Geoffrey S. T1 - CT Extended Hounsfield Unit Range in Radiotherapy Treatment Planning for Patients with Implantable Medical Devices T2 - World Congress on Medical Physics and Biomedical Engineering 2018. June 3-8, 2018, Prague, Czech Republic (Vol.3) N2 - 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. Y1 - 2018 SN - 978-981-10-9022-6 U6 - https://doi.org/10.1007/978-981-10-9023-3_111 SP - 599 EP - 603 PB - Springer CY - Singapore ER - TY - CHAP A1 - Euting, Stephan A1 - Araújo-Moreira, Fernando M. A1 - Zylka, Waldemar ED - Buzug, Thorsten M. ED - Borgert, Jörn T1 - Magnetic Particle Imaging Using Ferromagnetic Magnetization T2 - Magnetic Particle Imaging. A Novel SPIO Nanoparticle Imaging Technique N2 - Nanofluids, defined as fluids containing suspended solid nanoparticles, are potential systems for utilization in biomedical applications. Magnetic Particle Imaging (MPI) uses superparamagnetic nanofluids, e.g. a colloidal suspension of iron oxide particles. In this work a new biocompatible nanofluid based on pure and stable ferromagnetic carbon is investigated. Although this material has a relatively small value of coercive magnetic field, it does exhibit a true ferromagnetic behavior up to 300 K. We present results obtained from numerical investigations performed to calculate the impact of a ferromagnetic magnetization to the MPI signal chain. Moreover, by modeling ferromagnetic magnetization we prove here the general suitability of ferromagnetic materials for MPI. Due to the low saturation magnetization, however, MPI for ferromagnetic carbon will be possible only in the near future when realistic concentrations of the nanofluid ferromagnetic carbon will be experimentally obtainable. Y1 - 2012 SN - 978-3-642-24132-1 U6 - https://doi.org/10.1007/978-3-642-24133-8_3 SP - 15 EP - 20 PB - Springer CY - Berlin ER -