Zobrazeno 1 - 10
of 134
pro vyhledávání: '"Mika Teräs"'
Autor:
Reetta Siekkinen, Heidi Partanen, Linda Kukola, Tuula Tolvanen, Andrew Fenwick, Nadia A. S. Smith, Mika Teräs, Antti Saraste, Jarmo Teuho
Publikováno v:
EJNMMI Physics, Vol 11, Iss 1, Pp 1-17 (2024)
Abstract Background Several factors may decrease the accuracy of quantitative PET myocardial perfusion imaging (MPI). It is therefore essential to ensure that myocardial blood flow (MBF) values are reproducible and accurate, and to design systematic
Externí odkaz:
https://doaj.org/article/ef13705e570442a5bcd7087fbe4fc019
Publikováno v:
BMC Medical Imaging, Vol 22, Iss 1, Pp 1-14 (2022)
Abstract Background Attenuation correction is crucial in quantitative positron emission tomography-magnetic resonance (PET-MRI) imaging. We evaluated three methods to improve the segmentation and modelling of the attenuation coefficients in the nasal
Externí odkaz:
https://doaj.org/article/d4913f35b3654077970ff87ce8314a84
Autor:
Jarmo Teuho, Leon Riehakainen, Aake Honkaniemi, Olli Moisio, Chunlei Han, Marko Tirri, Shihao Liu, Tove J. Grönroos, Jie Liu, Lin Wan, Xiao Liang, Yiqing Ling, Yuexuan Hua, Anne Roivainen, Juhani Knuuti, Qingguo Xie, Mika Teräs, Nicola D’Ascenzo, Riku Klén
Publikováno v:
EJNMMI Research, Vol 10, Iss 1, Pp 1-17 (2020)
Abstract Background We investigated the image quality of 11C, 68Ga, 18F and 89Zr, which have different positron fractions, physical half-lifes and positron ranges. Three small animal positron emission tomography/computed tomography (PET/CT) systems w
Externí odkaz:
https://doaj.org/article/2b1021afa00e4f7398647b1a53ae1bfd
Publikováno v:
Applied Sciences, Vol 12, Iss 9, p 4605 (2022)
We studied whether TOF reduces error propagation from attenuation correction to PET image reconstruction in PET/MR neuroimaging, by using imperfect attenuation maps in a clinical PET/MR system with 525 ps timing resolution. Ten subjects who had under
Externí odkaz:
https://doaj.org/article/74ab153ab7cf4e53a003056b296d3af8
Autor:
Reetta Siekkinen, Jarmo Teuho, Nadia A. S. Smith, Andrew Fenwick, Anna K. Kirjavainen, Kalle Koskensalo, Antti Saraste, Mika Teräs
Publikováno v:
Frontiers in Physics, Vol 8 (2020)
Myocardial perfusion imaging (MPI) with positron emission tomography (PET) allows quantitative temporal measurements of the radioactive tracer distribution in tissue. The quantification for myocardial blood flow (MBF) is conducted with kinetic modeli
Externí odkaz:
https://doaj.org/article/244f551789234c618bd9cee64df3d3c3
Autor:
Jarmo Teuho, Angel Torrado-Carvajal, Hans Herzog, Udunna Anazodo, Riku Klén, Hidehiro Iida, Mika Teräs
Publikováno v:
Frontiers in Physics, Vol 7 (2020)
In this review, we will summarize the past and current state-of-the-art developments in attenuation and scatter correction approaches for hybrid positron emission tomography (PET) and magnetic resonance (MR) imaging. The current status of the methodo
Externí odkaz:
https://doaj.org/article/dab784690e784001a888b52a8221d4c4
Autor:
Mojtaba Jafari Tadi, Eero Lehtonen, Antti Saraste, Jarno Tuominen, Juho Koskinen, Mika Teräs, Juhani Airaksinen, Mikko Pänkäälä, Tero Koivisto
Publikováno v:
Scientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
Abstract Gyrocardiography (GCG) is a new non-invasive technique for assessing heart motions by using a sensor of angular motion – gyroscope – attached to the skin of the chest. In this study, we conducted simultaneous recordings of electrocardiog
Externí odkaz:
https://doaj.org/article/c5f6a43226dc4d538cbe384693cab354
Publikováno v:
Diagnostics, Vol 10, Iss 5, p 299 (2020)
Magnetic resonance imaging-only radiotherapy treatment planning (MRI-only RTP) and positron emission tomography (PET)–MRI imaging require generation of synthetic computed tomography (sCT) images from MRI images. In this study, initial dosimetric ev
Externí odkaz:
https://doaj.org/article/5de303ade1d24a449d23b005855a3b5d
Autor:
Mojtaba Jafari Tadi, Eero Lehtonen, Jarmo Teuho, Juho Koskinen, Jussi Schultz, Reetta Siekkinen, Tero Koivisto, Mikko Pänkäälä, Mika Teräs, Riku Klén
Publikováno v:
Sensors, Vol 19, Iss 19, p 4137 (2019)
Dual cardiac and respiratory gating is a well-known technique for motion compensation in nuclear medicine imaging. In this study, we present a new data fusion framework for dual cardiac and respiratory gating based on multidimensional microelectromec
Externí odkaz:
https://doaj.org/article/7a8b08bfe8bb48dbadaa3129f589e91b
Autor:
Miikka Tarkia, Antti Saraste, Christoffer Stark, Tommi Vähäsilta, Timo Savunen, Marjatta Strandberg, Virva Saunavaara, Tuula Tolvanen, Jarmo Teuho, Mika Teräs, Olli Metsälä, Petteri Rinne, Ilkka Heinonen, Nina Savisto, Mikko Pietilä, Pekka Saukko, Anne Roivainen, Juhani Knuuti
Publikováno v:
PLoS ONE, Vol 10, Iss 6, p e0131332 (2015)
Inflammation is an important contributor to atherosclerosis progression. A glucose analogue 18F-fluorodeoxyglucose ([18F]FDG) has been used to detect atherosclerotic inflammation. However, it is not known to what extent [18F]FDG is taken up in differ
Externí odkaz:
https://doaj.org/article/1de121f78aab4176ac98f82943d4eb7b