4D flow MRI Dotaz Zobrazit nápovědu
Cílem článku je seznámit čtenáře s výhodami a nevýhodami sekvence 4D Flow. Vyšetření touto sekvencí umožňuje retrospektivně zjistit průtok a jiné parametry toku v objemu zájmu. Je ovšem náročné jak z hlediska času, tak následného zpracování dat. Pro vysokou cenu komerčních programů může být pro uživatele nutné vytvořit si vlastní nástroje zpracování dat. Komerční programy poskytují omezené nástroje segmentace, ale naopak zvládají všechny základní korekce a nabízí množství funkcionalit. Přes svůj velký potenciál má sekvence svá omezení, zejména je to nízké prostorové rozlišení a dlouhá doba akvizice.
The goal of this paper is to inform about the 4D Flow sequence, its advantages and disadvantages. 4D Flow examination allows to assess flow rate and other flow parameters in the volume of interest retrospectively. However, it is expensive in terms of time and postprocessing. An in-house software may be necessary, as commercial programs remain costly. They offer a number of functionalities and data corrections. Their segmentations tools, however, remain relatively limited. Low spatial resolution and long data acquisition are the primary limitations of the sequence
- Klíčová slova
- 4D Flow,
- MeSH
- automatizované zpracování dat * metody MeSH
- diagnostické techniky kardiovaskulární přístrojové vybavení MeSH
- lidé MeSH
- magnetická rezonanční tomografie * metody MeSH
- reologie krve MeSH
- software MeSH
- vizualizace dat MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- práce podpořená grantem MeSH
- přehledy MeSH
We have studied T1 and T2 weighted MR images of thrombus from examination of patients with small abdominal aortic aneurysms in order to know whether the thrombus signal can be linked with the aortic diameter enlargement, and then could predict rupture risk of the aorta wall. Data were obtained from 16 patients with Small Abdominal Aortic Aneurysms (SAAA) who had been examined since July 2006 to January 2010 with MR Images. Several parameters were used to study the thrombus signal, such as mean, median, standard deviation, skewness and kurtosis. Each parameter was calculated for the thrombus area, and the signal in the muscle was used to normalize the mean, median and standard deviation of signal in thrombus. After then, those parameters were compared with evolution of the aortic diameter. 13 of the 16 patient with SAAA had a thrombus. Unfortunately there were no correlations between thrombus signals with the evolution of the aortic diameter (R often less then 0.3). But some parameter show links between thrombus signal and maximum diameter (mean (R=0.318)), median (R=0.318), skewness (R=0.304)) or with D maximum diameter (mean (R=0.512)). We cannot use thrombus signal alone as the parameter to predict the evolution of the aortic diameter. This study is the first step of our overall study. In the next step, we will use blood flow velocity with 3D/4D modelisation on the aortic aneurysm as a comparison parameter for predicting the rupture risk of the aortic wall. Moreover, relationship between flow data and thrombus will be studied.
Titlestad (Norway) * 462 -- * poster -- xii -- Section 4D. Bajla and M.Srámek (Slovakia) 683 -- Differentiation of Normal and Pathologic Brain Structures in MRI Wastl (Germany) 709 -- * poster -- XVI -- Estimation of Blood Flow in the Upper Gastrointestinal Tract Pöppl 1056 -- Complete Left Ventricular Wall Motion Estimation from Cascaded MRI-SPAMM Data -- J. Fukunaga: COMPUTER ANALYSIS OF THE MAXIMUM EXPIRATORY 529 FLOW VOLUME CURVE. (Japan) -- S.
IFIP world conference series on medical informatics Studies in health technology and informatics
sv. ; 27 cm
- MeSH
- informační systémy MeSH
- lékařská informatika MeSH
- lékařství MeSH
- Publikační typ
- kongresy MeSH
- sborníky MeSH
- Konspekt
- Lékařské vědy. Lékařství
- NLK Obory
- lékařská informatika