Purpose: Blood vessel (BV) information can be used to guide body organ segmentation on computed tomography (CT) imaging. The proposed method uses abdominal BVs (ABVs) segment the liver through portal phase of an CT dataset. This aims address wide variability in shape and size, separate from other organs similar intensity, hepatic low‐intensity tumors (LITs). Methods: Thin ABVs are enhanced using three‐dimensional (3D) opening. extracted classified into (HBVs) nonhepatic (non‐HBVs) with a...

Abstract Background The contact between the aorta, main pulmonary artery (MPA), vein, vena cava (VC), and esophagus affects segmentation of aorta MPA in non‐contrast‐enhanced computed tomography (NCE‐CT) images. Purpose A two‐stage stacked U‐Net localization were developed for NCE‐CT Methods Normal‐dose images 24 subjects with chronic thromboembolic hypertension (CTEPH) low‐dose 100 without CTEPH used this study. is ascending (AA) MPA, AA VC, aortic arch (AR) VC esophagus, descending (DA)...

Blood vessels are dispersed throughout the human body organs and carry unique information for each person. This can be used to delineate organ boundaries. The proposed method relies on abdominal blood (ABV) segment liver considering potential presence of tumors through portal phase a CT dataset. ABV extracted classified into hepatic (HBV) nonhepatic (non-HBV) with small number interactions. HBV non-HBV guide an automatic segmentation liver. individually core region construct boundary surface...

Chronic thromboembolic pulmonary hypertension (CTEPH) is characterized by obstruction of the vasculature residual organized thrombi. A morphological abnormality inside mediastinum CTEPH patient enlargement artery. This paper presents an automated assessment aortic and main arterial diameters for predicting in low-dose CT lung screening. The distinctive feature our method to segment aorta artery using both prior probability vascular direction which were estimated from mediastinal region...

Extraction of inter lobar fissure is an active study for diagnosis and treatment. However, lung diseased cases have problems. The proposed method covers cases, contains three phases coarse extract, fine extract correction, using behavior membrane. We applied this to normal cases. Rate (average±standard eviation) gold standard within 2 mm extraction result were 91.2±3.6% normal, 89.7±4.9% 95.5±3.7%, 93.6±4.8% diseased.

WE quantitatively analyzed the effect of graded left anterior descending and septal coronary flow (LAD + flow) reduction on ventricular function with a end-diastolic pressure (LVEDP) 6 mm Hg 12 Hg. We used an isolated, ejecting, canine heart preparation ( n = 8), which could be controlled independently aortic pressure. kept other hemodynamic variables - rate, circumflex flow, right input impendance constant within their normal physiologic range. considered this in LAD to analogous that most...

We have developed an anonymization system for DICOM images. It requires consent from the patient to use images research or education. However, providing image other facilities is not safe because it contains a lot of personal data. Our server that provides service users in facility. The distinctive features are, input interface, flexible policy, and automatic body part identification. In first feature, we can on existing workstations. second select best policy fitting Protection data ruled...

Objective This study aimed to assess the potential of an Ag additional filter attached bow tie a computed tomography (CT) scanner reduce radiation dose in CT localizer radiography. Methods Radiation doses radiography with Cu and filters were evaluated based on measurements Monte Carlo simulations. Image quality evaluations adult torso phantom performed, automatic exposure control performance was terms water-equivalent thickness estimated from radiographs. Results With filter, effective...

With the development of multi-slice CT technology, obtaining accurate 3D images lung field in a short time become possible. To support that, lot image processing methods need to be developed. Detection peripleural disease is difficult due its existence out region, because extraction often performed based on threshold processing. The proposed method uses thoracic inner region extracted by cavity bone as well air covers diseased cases such nodule, calcification, pleural effusion and plaque. We...

To evaluate bone strength, it is significant to measure the degree of deformation or strain under a certain load. However no method has been available non-invasively deformation. obtain mechanical properties such as elasticity, viscoelasticity and plasticity, we need externally apply load accurately small displacement specific point on surface bone. For measurements, improved echo-tracking (ET) system. The ET system consists diagnostic ultrasound with 7.5 MHz linear probe PC. PZF echo...

In this paper, the drag prediction method (wake integration method) based on momentum conservation theorem was applied to aerodynamic investigations aircraft model. The wake survey of model is performed obtain basic data evaluate how applicable technique tests in a relatively small low-speed wind tunnel. case, it important investigate effect measurement interval by survey. same geometry that used for correction tunnel test previously. free-stream velocity kept be 30 m/s. Reynolds number mean...

At liver surgery planning stage, the volumetry would be essential for surgeons. Main problem at extraction is wide variability of livers in shapes and sizes. Since, hepatic blood vessels structure varies from a person to another covers region, present method uses that information two stages. The first stage extract abdominal form nonhepatic vessels. second extracted are used control region automatically. Contrast enhanced CT datasets only portal phase 50 cases used. Those data include 30...

Relationship of annual change in bone mineral density with extent emphysematous lesions and pulmonary function patients COPD Kenichi Goto,1,2 Emiko Ogawa,1,3 Kaoruko Shimizu,4 Hironi Makita,4 Hidenobu Suzuki,5 Yoshiki Kawata,5 Noboru Niki,5 Masaharu Nishimura,4 Yasutaka Nakano1 1Division Respiratory Medicine, Department Shiga University Medical Science, Otsu, Shiga, 2Department Pulmonary Takatsuki Red Cross Hospital, Takatsuki, Osaka, 3Health Administration Center, 4First Hokkaido Sapporo,...

Enlargement of the pulmonary artery is a morphological abnormality hypertension patients. Diameters aorta and main (MPA) are useful for predicting presence hypertension. A major problem in automatic segmentation MPA from non-contrast CT images invisible boundary caused by contact with blood vessels. In this study, we applied U-Net to normal chronic thromboembolic (CTEPH) cases evaluated robustness contacts between Our approach consists three steps: (1) detection trachea branch point, (2)...

Automated distinction of medical images is an important preprocessing in Computer-Aided Diagnosis (CAD) systems. The CAD systems have been developed using image sets with specific scan conditions and body parts. However, varied examinations are performed sites. specification the examination contained into DICOM textual meta information. Most information can be considered reliable, however part cannot always reliable. In this paper, we describe automated as a for lung cancer system. Our...

The patients of osteoporosis comprised about 13 million people in Japan and it is one the problems aging society has. In order to prevent osteoporosis, necessary do early detection treatment. Multi-slice CT technology has been improving three dimensional (3-D) image analysis with higher body axis resolution shorter scan time. 3-D using multi-slice images thoracic vertebra can be used as a support diagnose at same time for lung cancer diagnosis which may lead detection. We develop automatic...

240,000 participants have a screening for diagnosis of pneumoconiosis every year in Japan. Radiograph is used staging severity worldwide. This paper presents method quantitative assessment using both size and frequency lung nodules that detected by thin-section CT images. consists three steps. First, thoracic organs (body, ribs, spine, trachea, bronchi, lungs, heart, pulmonary blood vessels) are segmented. Second, radius over 1.5mm detected. These steps functions our developed computer aided...

Chronic obstructive pulmonary disease is a major public health problem that predicted to be third leading cause of death in 2030. Although spirometry traditionally used quantify emphysema progression, it difficult detect the loss function by early stage, and assess susceptibility smoking. This study presents quantification method smoking-induced progression based on annual changes low attenuation volume (LAV) each lung lobe acquired from low-dose CT images cancer screening. The consists...

Computed tomography has been used for assessing structural abnormalities associated with emphysema. It is important to develop a robust CT based imaging biomarker that would allow quantification of emphysema progression in early stage. This paper presents effect smoking on using annual changes low attenuation volume (LAV) by each lung lobe acquired from low-dose images longitudinal screening cancer. The percentage LAV (LAV%) was measured after applying value threshold method and small noise...

This study evaluated the effect of pitch on 256-slice helical computed tomography (CT) scans. Cylindrical water phantoms (CWP) were measured using axial and scans with various values. The surface dose distributions CWP measured, reconstructed images obtained filtered back-projection (FBP) iterative model reconstruction (IMR). image noise in each was decomposed into a baseline component another that varied along z-axis. highest at center decreased toward edges. normalized 2D power spectra for...