Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Przeglądasz jako GOŚĆ
Tytuł pozycji:

Influence of Convolution Kernel and Beam-Hardening Effect on the Assessment of Trabecular Bone Mineral Density Using Quantitative Computed Tomography

Tytuł :
Influence of Convolution Kernel and Beam-Hardening Effect on the Assessment of Trabecular Bone Mineral Density Using Quantitative Computed Tomography
Autorzy :
Ivanov, Dmitriy V.
Kirillova , Irina Vasilevna
Kossovich, Leonid Yurevich
Bessonov , Leonid Valentinovich
Petraikin, Alexey Vladimirovich
Dol, Aleksandr Viktorovich
Ahmad, Ekaterina Sergeevna
Morozov, Sergey Pavlovich
Vladzymyrskyy, Anton Vycheslavovich
Sergunova, Kristina Anatolievna
Kharlamov, Aleksandr Vladimirovich
Pokaż więcej
Temat :
computed tomography
quantitative computed tomography
bone mineral density
hounsfield unit
convolution kernel
Mathematics
QA1-939
Źródło :
Известия Саратовского университета. Новая серия. Серия Математика. Механика. Информатика, Vol 20, Iss 2, Pp 205-219 (2020)
Wydawca :
Saratov State University, 2020.
Rok publikacji :
2020
Kolekcja :
LCC:Mathematics
Typ dokumentu :
article
Opis pliku :
electronic resource
Język :
English
Russian
ISSN :
1816-9791
2541-9005
Relacje :
https://mmi.sgu.ru/sites/mmi.sgu.ru/files/2020/05/205-219ivanov_et_al.pdf; https://doaj.org/toc/1816-9791; https://doaj.org/toc/2541-9005
DOI :
10.18500/1816-9791-2020-20-2-205-219
Dostęp URL :
https://doaj.org/article/31c304ec89bf43c0ace9533665284475
Numer akcesji :
edsdoj.31c304ec89bf43c0ace9533665284475
Czasopismo naukowe
Quantitative computed tomography along with densitometry is used to assess mineral density and strength of bone tissue. Raw data obtained by computed tomography are converted by software using convolution kernels. It is known that the use of convolution kernels can significantly change tissue density, which is measured in Hounsfield units. The beam-ardening effect is described in literature: when x-ray passes through an object, the absorption of lower-energy x-ray photons occurs. Therefore, scanning objects �in the air� without surrounding soft tissues of the human body gives distorted Hounsfield units relative to their real values. This work is aimed at assessing the effect of various convolution kernels, beam-hardening effect, as well as other CT scanner settings for Hounsfield units. In this work, we studied samples of trabecular bone tissue of the femoral heads and calibrated samples of an aqueous solution of dipotassium hydrogen phosphate with known mineral density. Trabecular bone tissue samples of the femoral heads and calibrated samples of an aqueous solution of dipotassium hydrogen phosphate with known mineral density were scanned on Toshiba Aquilion 64 scanner. The samples were scanned in various modes: at different tube currents, �in the air� and inside the calibration phantom. The resulting images processed by the FC17 and FC03 convolution kernels were analyzed. It was shown that tube current magnitude practically does not affect the Hounsfield units. Different convolution kernels demonstrate significantly different Hounsfield units when scanning the same samples �in the air�. It has been confirmed that the beam-hardening effect significantly affects the Hounsfield units and should be considered when evaluating bone mineral density. No differences were found in measurements �in the air� and in the phantom at a significance level of 5 percent for the FC03 kernel, which confirms the fact that FC03 is intended to correct the beam- ardening effect. An ambiguous relationship was noted between the Hounsfield units and the mineral density for low-density samples when scanned with the FC03 kernel. FC17 kernel, in comparison with FC03, is considered more preferable and suitable for assessing bone mineral density. However, pre-calibration with phantom is required for a wide range of preset mineral densities. Regression dependencies were obtained for recalculation of Hounsfield units from experiments �in the air� to Hounsfield units of the same samples scanned in surrounding tissues (in the phantom).

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies