Evaluation of patient-specific motion management for radiotherapy planning computed tomography using a statistical method

Statistical evaluation of the effectiveness of dual amplitude-gated stereotactic body radiotherapy using fiducial markers and lung volume

“…The slight differences in positional coordinates between the lung tumor and fiducial markers were likely caused by complicated respiratory movements, including linear movement and looping and hysteresis curves [6] . Therefore, determining each patient’s optimal fiducial marker is important for accurately tracking the lung tumor and maximizing treatment quality using pretreatment 4DCT and 4D magnetic resonance imaging [9] , [14] .…”

“…Four-dimensional computed tomography (4DCT) with a body surface infrared marker is useful to determine the movement of a lung tumor or fiducial marker before planning SBRT [9] . The 4DCT enables the measurement of lung volumes and evaluates the relationship of respiratory movements between lung volume and lung tumors.…”

Patient-specific respiratory motion management using lung tumors vs fiducial markers for real-time tumor-tracking stereotactic body radiotherapy

“…In addition, this study evaluated the amplitude difference between the lung tumor and fiducial markers using 4DCT, which may include uncertain underestimations and overestimations of respiratory movements and resolution limits of the phase numbers via 4DCT [19] . The spatial coordinates of the fiducial marker may be displaced during SBRT, and the amplitude difference between the lung tumor and fiducial marker should be observed during SBRT [20] . In the future, we believe that more robust and dynamic tracking during SBRT may be realized by combining magnetic resonance imaging and respiration by lung volume in addition to fiducial marker [9] , [12] , [21] , [22] .…”