Estimation of Rigid-Body and Respiratory Motion of the Heart From Marker-Tracking Data for SPECT Motion Correction
Estimation of Rigid-Body and Respiratory Motion of the Heart From Marker-Tracking Data for SPECT Motion Correction
复制标题
DOI：
10.1109/tns.2008.2010319
复制
发表时间：
2009-02-01
影响因子：
1.8
通讯作者：
King, Michael A.
中科院分区：
文献类型：
--
作者：
Mukherjee, Joyeeta Mitra;McNamara, Joseph E.;King, Michael A.
运动或接受心脏SPECT灌注成像的患者会导致采集图像中的伪影，这可能导致难以解读。我们的工作研究了一种技术，获得病人的运动估计从回射标记上的拉伸带包裹在胸部和腹部的病人被成像临床。从标记获得的运动信号包括至少两个分量，身体运动（BM）和由于呼吸引起的周期性运动（PM）。我们提出了一种方法，用于分离这些组件的运动卡车数据的每个标记，然后报告的方法相结合的BM估计从胸部标记估计的6自由度（6-DOF）的刚体运动（RBM）的心脏。志愿者和病人的运动研究被用来评估的方法。由于患者的身体运动和呼吸（向上蠕动）的心脏的运动的说明性的例子，并直接从SPECT数据获得的心脏的运动的估计相比。我们的运动卡车的方法被认为是给合理的协议，从SPECT数据的运动估计，同时大大减少噪音。
Motion or patients undergoing cardiac SPECT perfusion imaging causes artifacts in the acquired images which may lead to difficulty in interpretation. Our work investigates a technique of obtaining patient motion estimates from retro-reflective markers on stretchy bands wrapped around the chest and abdomen of patients being imaged clinically. Motion signals obtained from the markers consist of at least two components, body motion (BM) and periodic motion (PM) due to respiration. We present a method for separating these components from the motion-trucking data of each marker, and then report a method for combining the BM estimated from chest markers to estimate the 6-degree-of-freedom (6-DOF) rigid-body motion (RBM) of the heart. Motion studies of volunteers and patients are used to evaluate the methods. Illustrative examples of the motion of the heart due to patient body movement and respiration (upward creep) are presented and compared to estimates of the motion of the heart obtained directly from SPECT data. Our motion-trucking method is seen to give reasonable agreement with the motion-estimates from the SPECT data while being considerably less noisy.