Abstract：
RATIONALE AND OBJECTIVES:The segmentation of airways from CT images is a critical first step for numerous virtual bronchoscopic (VB) applications. Automatic or semiautomatic methods are necessary, since manual segmentation is prohibitively time consuming. The methods must be robust and operate within a reasonable time frame to be useful for clinical VB use. The authors developed an integrated airway segmentation system and demonstrated its effectiveness on a series of human images. MATERIALS AND METHODS:The authors' airway segmentation system draws on two segmentation algorithms: (a) an adaptive region-growing algorithm and (b) a new hybrid algorithm that uses both region growing and mathematical morphology. Images from an ongoing VB study were segmented by means of both the adaptive region-growing and the new hybrid methods. The segmentation volume, branch number estimate, and segmentation quality were determined for each case. RESULTS:The results demonstrate the need for an integrated segmentation system, since no single method is superior for all clinically relevant cases. The region-growing algorithm is the fastest and provides acceptable segmentations for most VB applications, but the hybrid method provides superior airway edge localization, making it better suited for quantitative applications. In addition, the authors show that prefiltering the image data before airway segmentation increases the robustness of both region-growing and hybrid methods. CONCLUSION:The combination of these two algorithms with the prefiltering options allowed the successful segmentation of all test images. The times required for all segmentations were acceptable, and the results were suitable for the authors' VB application needs.
journal_name
Acad Radioljournal_title
Academic radiologyauthors
Kiraly AP,Higgins WE,McLennan G,Hoffman EA,Reinhardt JMdoi
10.1016/s1076-6332(03)80517-2keywords:
subject
Has Abstractpub_date
2002-10-01 00:00:00pages
1153-68issue
10eissn
1076-6332issn
1878-4046journal_volume
9pub_type
杂志文章abstract：RATIONALE AND OBJECTIVES:The authors evaluated the clinical utility of image coregistration in the interpretation of follow-up computed tomographic (CT) studies of the head. MATERIALS AND METHODS:Fourteen patients with 34 intracranial lesions underwent follow-up head CT. The images were coregistered automatically with...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/s1076-6332(03)80097-1
更新日期：2003-03-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:Balloon dilatation is a mechanical form of controlled injury used to alleviate vascular stenoses. Several factors influence successful angioplasty. Few mechanical models exist to illustrate the physical principles of balloon dilatation. METHODS:We used mechanical analysis of membrane stresses,...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/s1076-6332(05)80340-x
更新日期：1995-05-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:Mammographic breast density is an important and widely accepted risk factor for breast cancer. A statement about breast density in the mammographic report is becoming a requirement in many States. However, there is significant inter-observer variation between radiologists in their interpretatio...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2011.07.011
更新日期：2011-11-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:The authors used magnetic resonance (MR) imaging to investigate the correlation between T2* measurements of trabecular bone and the ultimate compressive strength of lumbar porcine vertebrae. METHODS:Five pigs that weighted 25-32 kg were sacrificed and imaged with a 1.5-T MR system. T2* of the ...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/s1076-6332(97)80050-5
更新日期：1997-06-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:The objective of this study was to assess whether changes to radiographic parameters before and after treatment with antiangiogenic drugs would improve performance in predicting tumor response with non-contrast-enhanced computed tomography (NCECT) compared to Response Evaluation Criteria in Sol...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2014.06.007
更新日期：2014-11-01 00:00:00
abstract：:This review article presents the current evidence of the importance of integrating radiology and anatomy in medical education in the UK, a recommendation by a number of key anatomy, education, and radiology organizations. Current evidence highlights that on average only 5% of total teaching time in medical education i...
journal_title：Academic radiology
pub_type： 杂志文章,评审
doi：10.1016/j.acra.2015.12.010
更新日期：2016-04-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:To investigate a multimodality computer-aided diagnosis (CAD) scheme that combines image information from full-field digital mammography (FFDM) and dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) for computerized breast cancer classification. MATERIALS AND METHODS:From a retrosp...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2010.04.015
更新日期：2010-09-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:The purpose of this study was to compare the efficacy of dual-energy computed tomography (DECT), time-resolved magnetic resonance (MR) imaging (MRI) perfusion measurements, and high-resolution MR angiography (MRA) for the detection of pulmonary embolism (PE) in a rabbit model. MATERIALS AND ME...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2010.09.004
更新日期：2010-12-01 00:00:00
abstract：RATIONALE AND OBJECTIVE:Abnormal neurodevelopment may play a role in the pathophysiology of schizophrenia. We used deformation-based morphometry to examine voxel-wise age-related changes in patients with schizophrenia compared with healthy brains. MATERIALS AND METHODS:We used a set of skull-stripped brains from an im...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2004.06.009
更新日期：2005-01-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:The aim of this study was to evaluate the predictive value of intraluminal air for appendiceal necrosis and/or perforation when not apparent on imaging. Additional factors of intraluminal appendicoliths, age, and gender were also assessed. MATERIALS AND METHODS:Patients with pathologically pro...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2012.04.018
更新日期：2012-10-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:The aim of this study is to assess the usefulness of computer-aided three-dimensional (3D) measurement of volume and computed tomography (CT) attenuation values of nodes for diagnosing nodal metastases of lung cancer. MATERIALS AND METHODS:We measured three diameters, their ratios, volume, and...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2013.01.013
更新日期：2013-06-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:This study explores morphological relationships and structural variability of the corpus callosum (CC), fornix (Fo), anterior (AC), and posterior commissures (PC). MATERIALS AND METHODS:These structures are extracted automatically on the midsagittal plane. The CC and Fo are modeled using best-...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2005.06.018
更新日期：2006-01-01 00:00:00
abstract：RATIONALE AND OBJECTIVE:Today, the exchange of medical images and clinical information is well defined by the digital imaging and communications in medicine (DICOM) and Health Level Seven (ie, HL7) standards. The interoperability among information systems is specified by the integration profiles of IHE (Integrating the...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2004.11.015
更新日期：2005-03-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:To investigate the relationship between apparent diffusion coefficient (ADC) values and the Ki-67 staining index (Ki-67 SI), a tumor proliferation marker, in prostate cancer (PCa). MATERIALS AND METHODS:Forty-three patients with PCa and thirty-six patients with benign prostatic hyperplasia (BP...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2013.09.007
更新日期：2013-12-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:The aims of this study were to quantify resident anxiety when beginning independent call and to assess whether an apprenticeship experience (buddy call) can lessen anxiety and improve confidence. MATERIALS AND METHODS:A prospective cohort comparison of two groups of radiology residents beginni...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2011.04.015
更新日期：2011-09-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:To assess computed tomographic (CT) signs that have been described in published studies for the diagnosis of appendicitis to identify independent findings that predict appendicitis. METHODS AND MATERIALS:A retrospective database search identified 67 patients with a CT scan of the abdomen/pelvi...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2008.02.009
更新日期：2008-08-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:The objective of our study was to determine if the T1-weighted magnetic resonance imaging (MRI) features associated with diabetic pedal osteomyelitis are present in histopathologically proven cases of non-pedal osteomyelitis. MATERIALS AND METHODS:Seventy-five patients with a histopathological...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2012.07.015
更新日期：2013-01-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:Selecting the optimal phase for coronary artery evaluation can be challenging, especially at higher heart rates, given that the optimal phase may differ for each of the coronary arteries. This study aimed to evaluate a novel vessel-specific algorithm which automatically outputs the minimum moti...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2015.01.013
更新日期：2015-06-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:The authors performed this study to assess the performance of a computer-based classification system that uses gaze locations of observers to define the subspace for machine learning. MATERIALS AND METHODS:Thirty-two dental radiographs were classified by an expert viewer into four categories o...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/S1076-6332(03)80706-7
更新日期：2001-12-01 00:00:00
abstract：OBJECTIVE:To investigate the correlation between dynamic susceptibility contrast magnetic resonance imaging (DSC-MRI) parameters and angiogenesis and to explore prospectively the feasibility of using DSC-MRI to differentiate malignant from benign soft tissue tumors (STTs) in limbs. METHODS:This prospective study inclu...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2019.04.023
更新日期：2020-03-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:To noninvasively estimate the severity of liver fibrosis using perfusion-CT (PCT)-based quantification of dual liver blood supply prior to liver transplantation or liver resections and to correlate results with histological grading of fibrosis stages and AST-platelet ratio index. MATERIALS AND...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2018.11.009
更新日期：2019-09-01 00:00:00
abstract：:Computer-aided detection (CADe) and computer-aided diagnosis (CADx) have been important areas of research in the last two decades. Significant progress has been made in the area of breast cancer detection, and CAD techniques are being developed in many other areas. Recent advances in multidetector row computed tomogra...
journal_title：Academic radiology
pub_type： 杂志文章,评审
doi：10.1016/j.acra.2008.01.014
更新日期：2008-05-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:To document the frequency of normal and anomalous drainage patterns of the pulmonary veins, and to establish normal values for pulmonary vein ostial diameters, and distance to first bifurcation using multidetector computed tomography, as pertinent to ablation procedures for atrial fibrillation....
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2006.11.004
更新日期：2007-02-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:Computed tomography (CT) was used to noninvasively monitor local drug pharmacokinetics from polymer implants in rat livers before and following radiofrequency ablation. MATERIALS AND METHODS:Polymer matrixes containing carboplatin (a platinum-containing chemotherapeutic agent) were implanted i...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2004.09.007
更新日期：2004-12-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:The aim of the study is to develop a theory-based signal calibration approach to be used for the conversion of signal-time curves to absolute contrast concentration-time curves for first-pass contrast-enhanced quantitative myocardial perfusion studies. MATERIALS AND METHODS:A normalization pro...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2006.02.040
更新日期：2006-06-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:We sought to quantify patient preferences for mild, moderate, and severe low back pain via time-tradeoff analysis and utility measurement. MATERIALS AND METHODS:Forty-one patients being treated for low back pain in a tertiary care teaching hospital participated in the study. Patients were aske...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2004.11.031
更新日期：2005-04-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:Prospective studies of radiologists' interpretations of selected radiographs reported 20-40 years ago indicated error rates of 30% and higher. The authors retrospectively evaluated the interpretations of groups of radiologists and determined a range of rates of disagreement in interpretation. Q...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/s1076-6332(98)80277-8
更新日期：1998-03-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:The aim of this study was to determine the sonographic visibility of implanted collagen-based breast biopsy marker clips in the clinic and operating room. MATERIALS AND METHODS:Female patients aged > or =18 years who presented for preoperative surgical evaluation within 4 weeks of ultrasound-g...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2009.10.017
更新日期：2010-03-01 00:00:00
abstract：RATIONALE AND OBJECTIVE:We sought to establish medical students' perspectives of a set of curriculum topics for radiology teaching. MATERIALS AND METHODS:A multicenter study was conducted in New Zealand. A modified Delphi method was adopted. Students enrolled in two New Zealand Universities received a questionnaire. E...
journal_title：Academic radiology
pub_type： 杂志文章,多中心研究
doi：10.1016/j.acra.2006.02.034
更新日期：2006-07-01 00:00:00
abstract：RATIONALE AND OBJECTIVES:The aim of the present study was to examine the usefulness and record the complications of preoperative lipiodol marking using computed tomographic (CT) fluoroscopy for the intraoperative localization of 107 pulmonary nodules. METHODS:Lipiodol marking was performed under CT fluoroscopic guidan...
journal_title：Academic radiology
pub_type： 杂志文章
doi：10.1016/j.acra.2008.07.012
更新日期：2009-01-01 00:00:00
