PURPOSE: The effects of @entity5 location and pulmonary function on the motion of fiducial markers near @entity2 were evaluated to deduce simple guidelines for determining the internal margin in radiotherapy without fiducial markers. METHODS AND MATERIALS: Pooled data collected by a real-time @entity5 -tracking radiotherapy system on 42 markers in 39 @entity1 were analyzed. The pulmonary functions of all @entity1 were assessed before radiotherapy. Using chest X-ray film, the position of the marker was expressed relative to the geometry of the unilateral lung. Posterior location meant the area of the posterior half of the lung in a lateral chest X-ray film, and caudal location meant the caudal half of the chest X-ray film; these categories were determined by measuring the distance between the marker and anatomic landmarks, including the apex, costophrenic angle, midline of spinal canal, lateral, anterior, and posterior boundary of the lung. RESULTS: Before the radiotherapy, 18 @entity1 had obstructive @entity1576 (ratio of forced expiratory volume in 1 s to forced vital capacity [FEV1.0/FVC] <70), 5 @entity1 had @entity409 (percent vital capacity [%VC] <80), and 3 had @entity409 . Means of FEV1.0/FVC and %VC were 97.0% and 66.5%, respectively. Median @entity5 movements in the x (left-right), y (anteroposterior), and z (craniocaudal) directions were 1.1 mm, 2.3 mm, and 5.4 mm, respectively. There was no significant correlation between respiratory function and magnitude of marker movement in any direction. Median marker movement in the z direction was 2.6 mm for the cranial location and 11.8 mm for the caudal location, respectively (p < 0.001). Median movement in the z direction was 11.8 mm for posterior location and 3.4 mm for anterior location, respectively (p < 0.01). CONCLUSIONS: Simple measurement of the relative location on plain chest X-ray film was related, but respiratory function test was not related, to the craniocaudal amplitude of the motion of the fiducial marker near @entity2 .

The effect of XXXX location and respiratory function on @entity5 movement estimated by real-time tracking radiotherapy (RTRT) system.

@entity1 :: ('9606', 'Species') :: ['patients'] @entity5 :: ('MESH:D009369', 'Disease') :: ['tumor'] @entity409 :: ('MESH:D008107', 'Disease') :: ['constrictive dysfunction', 'mixed dysfunction'] @entity2 :: ('MESH:D008175', 'Disease') :: ['lung tumors'] @entity1576 :: ('MESH:D012131', 'Disease') :: ['respiratory dysfunction']
@entity5 :: (MESH:D009369,Disease) :: ['tumor']
