Motion of the Esophagus Due to Cardiac Motion
نویسندگان
چکیده
منابع مشابه
Motion of the Esophagus Due to Cardiac Motion
When imaging studies (e.g. CT) are used to quantify morphological changes in an anatomical structure, it is necessary to understand the extent and source of motion which can give imaging artifacts (e.g. blurring or local distortion). The objective of this study was to assess the magnitude of esophageal motion due to cardiac motion. We used retrospective electrocardiogram-gated contrast-enhanced...
متن کاملLiver Motion Due to Needle Pressure, Cardiac, and Respiratory Motion During the TIPS Procedure
TIPS (Transjugular Intrahepatic Portosystemic Shunt) is an effective treatment for portal hypertension. However, during the procedure, respiration, needle pressure, and possibly other factors cause the liver to move. This complicates the procedure since the portal vein is not visible during needle insertion. We present the results of a study of intraoperative liver motion.
متن کاملCompensation of signal loss due to cardiac motion in point-resolved spectroscopy of the heart.
PURPOSE To study the influence of cardiac motion on point-resolved single voxel spectroscopy (PRESS) of the human heart and to propose an improved sequence design to compensate for cardiac motion-related signal losses. METHODS Numerical simulations and in vivo measurements were performed to study motion effects in cardiac spectroscopy. Based on the findings, an improved PRESS sequence with re...
متن کاملIllusory motion due to causal time filtering
A new class of patterns, composed of repeating patches of asymmetric intensity profile, elicit strong perception of illusory motion. We propose that the main cause of this illusion is erroneous estimation of image motion induced by fixational eye movements. Image motion is estimated with spatial and temporal energy filters, which are symmetric in space, but asymmetric (causal) in time. That is,...
متن کاملBand artifacts due to bulk motion.
Band artifacts due to bulk motion were investigated in images acquired with fast gradient echo sequences. A simple analytical calculation shows that the width of the artifacts has a square-root dependence on the velocity of the imaged object, the time taken to acquire each line of k-space and the field of view in the phase-encoding direction. The theory furthermore predicts that the artifact wi...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: PLoS ONE
سال: 2014
ISSN: 1932-6203
DOI: 10.1371/journal.pone.0089126