Abstract:
PURPOSE:Accurate target delineation is a critical step in radiotherapy. In this study, a robust contour propagation method is proposed to help physicians delineate lung tumors in four-dimensional computer tomography (4D-CT) images efficiently and accurately. METHODS:The proposed method starts with manually delineated contours on the reference phase. Each contour is fitted by a non-uniform cubic B-spline curve, and its deformation on the target phase is achieved by moving its control vertexes such that the intensity similarity between the two contours is maximized. Since contour is usually the boundary of lesion or tissue which may deform quite differently from the tissues outside the boundary, the proposed method treats each contour as a deformable entity, a non-uniform cubic B-spline curve, and focuses on the registration of contour entity instead of the entire image to avoid the deformation of contour to be smoothed by its surrounding tissues, meanwhile to greatly reduce the time consumption while keeping the accuracy of the contour propagation. Eighteen 4D-CT cases with 444 gross tumor volume (GTV) contours manually delineated slice by slice on the maximal inhale and exhale phases are used to verify the proposed method. RESULTS:The Jaccard similarity coefficient (JSC) between the propagated GTV and the manually delineated GTV is 0.885 ± 0.026, and the Hausdorff distance (HD) is [Formula: see text] mm. In addition, the time for propagating GTV to all the phases is 3.67 ± 3.41 minutes. The results are better than fast adaptive stochastic gradient descent (FASGD) B-spline method, 3D+t B-spline method and diffeomorphic Demons method. CONCLUSIONS:The proposed method is useful to help physicians delineate target volumes efficiently and accurately.
journal_name
Int J Comput Assist Radiol Surgauthors
Liu Y,Jin R,Chen M,Song E,Xu X,Zhang S,Hung CCdoi
10.1007/s11548-016-1457-5subject
Has Abstractpub_date
2016-12-01 00:00:00pages
2139-2151issue
12eissn
1861-6410issn
1861-6429pii
10.1007/s11548-016-1457-5journal_volume
11pub_type
杂志文章abstract:PURPOSE:Breast masses exhibit variability in margins, shapes, and dimensions, so their detection is a difficult task in mammographic computer-aided diagnosis. Mass detection is usually a two-step procedure: mass identification and false-positive reduction. A new method to automatically detect mass lesions in mammograph...
journal_title:International journal of computer assisted radiology and surgery
pub_type: 杂志文章
doi:10.1007/s11548-011-0659-0
更新日期:2012-07-01 00:00:00
abstract:PURPOSE:Our particular motivator is the need for screening HIV+ populations in resource-constrained regions for the evidence of tuberculosis, using posteroanterior chest radiographs (CXRs). METHOD:The proposed method is motivated by the observation that abnormal CXRs tend to exhibit corrupted and/or deformed thoracic ...
journal_title:International journal of computer assisted radiology and surgery
pub_type: 杂志文章
doi:10.1007/s11548-016-1359-6
更新日期:2016-09-01 00:00:00
abstract:PURPOSE:Minimally invasive interventions offer benefits for patients, while also entailing drawbacks for surgeons, such as the loss of depth perception. Thus estimating distances, which is of particular importance in gastric bypasses, becomes difficult. In this paper, we propose an approach based on stereo endoscopy th...
journal_title:International journal of computer assisted radiology and surgery
pub_type: 杂志文章
doi:10.1007/s11548-015-1291-1
更新日期:2016-03-01 00:00:00
abstract:PURPOSE:Ultrasound is increasingly being employed in different orthopedic procedures as an imaging modality for real-time guidance. Nevertheless, low signal-to-noise-ratio and different imaging artifacts continue to hamper the success of ultrasound-based procedures. Bone shadow region is an important feature indicating...
journal_title:International journal of computer assisted radiology and surgery
pub_type: 杂志文章
doi:10.1007/s11548-017-1556-y
更新日期:2017-06-01 00:00:00
abstract:OBJECTIVE:For planning surgical interventions at the spine affected by osteoporosis, accurate information about the local bone quality in terms of anchorage strength for implants is very important. Based on previous work on automated bone quality assessment on the proximal femur with a completely automated model-based ...
journal_title:International journal of computer assisted radiology and surgery
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doi:10.1007/s11548-009-0287-0
更新日期:2009-05-01 00:00:00
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更新日期:2020-12-01 00:00:00
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journal_title:International journal of computer assisted radiology and surgery
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journal_title:International journal of computer assisted radiology and surgery
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doi:10.1007/s11548-018-1740-8
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journal_title:International journal of computer assisted radiology and surgery
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journal_title:International journal of computer assisted radiology and surgery
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更新日期:2017-08-01 00:00:00
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journal_title:International journal of computer assisted radiology and surgery
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更新日期:2010-01-01 00:00:00
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journal_title:International journal of computer assisted radiology and surgery
pub_type: 杂志文章
doi:10.1007/s11548-015-1329-4
更新日期:2016-07-01 00:00:00
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更新日期:2014-11-01 00:00:00
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更新日期:2009-09-01 00:00:00
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pub_type: 杂志文章
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更新日期:2016-01-01 00:00:00
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更新日期:2014-03-01 00:00:00
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journal_title:International journal of computer assisted radiology and surgery
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更新日期:2018-07-01 00:00:00
abstract:PURPOSE:As the spectrum of X-ray procedures has increased both for diagnostic and for interventional cases, more attention is paid to X-ray dose management. While the medical benefit to the patient outweighs the risk of radiation injuries in almost all cases, reproducible studies on organ dose values help to plan preve...
journal_title:International journal of computer assisted radiology and surgery
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更新日期:2021-01-01 00:00:00
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更新日期:2015-02-01 00:00:00
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journal_title:International journal of computer assisted radiology and surgery
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更新日期:2018-09-01 00:00:00
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更新日期:2019-09-01 00:00:00
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journal_title:International journal of computer assisted radiology and surgery
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doi:10.1007/s11548-013-0958-8
更新日期:2014-07-01 00:00:00
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journal_title:International journal of computer assisted radiology and surgery
pub_type: 杂志文章
doi:10.1007/s11548-017-1538-0
更新日期:2017-09-01 00:00:00
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journal_title:International journal of computer assisted radiology and surgery
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journal_title:International journal of computer assisted radiology and surgery
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journal_title:International journal of computer assisted radiology and surgery
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更新日期:2016-01-01 00:00:00
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journal_title:International journal of computer assisted radiology and surgery
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更新日期:2018-10-01 00:00:00