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liver 3D reconstruction

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https://www.readbyqxmd.com/read/28577725/postoperative-liver-volume-was-accurately-predicted-by-a-medical-image-three-dimensional-visualization-system-in-hepatectomy-for-liver-cancer
#1
Wei Cai, Yingfang Fan, Haoyu Hu, Nan Xiang, Chihua Fang, Fucang Jia
BACKGROUND: Liver cancer is the second most common cause of cancer death worldwide. The hepatectomy is the most effective and the only potentially curative treatment for patients with resectable neoplasm. Precisely preoperative assessment of remnant liver volume is essential in preventing postoperative liver failure. The aim of our study is to report our experience of using a medical image three dimensional (3D) visualization system (MI-3DVS), which was developed by our team, in assisting hepatectomy for patients with liver cancer...
June 2017: Surgical Oncology
https://www.readbyqxmd.com/read/28574221/validation-of-a-method-for-in%C3%A2-vivo-3d-dose-reconstruction-in-sbrt-using-a-new-transmission-detector
#2
Yuji Nakaguchi, Takeshi Ono, Masato Maruyama, Yoshinobu Shimohigashi, Yudai Kai
Stereotactic body radiation therapy (SBRT) involves the delivery of substantially larger doses over fewer fractions than conventional therapy. Therefore, SBRT treatments will strongly benefit patients using vivo patient dose verification, because the impact of the fraction is large. For in vivo measurements, a commercially available quality assurance (QA) system is the COMPASS system (IBA Dosimetry, Germany). For measurements, the system uses a new transmission detector (Dolphin, IBA Dosimetry). In this study, we evaluated the method for in vivo 3D dose reconstruction for SBRT using this new transmission detector...
June 2, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28550405/projective-biomechanical-depth-matching-for-soft-tissue-registration-in-laparoscopic-surgery
#3
Daniel Reichard, Dominik Häntsch, Sebastian Bodenstedt, Stefan Suwelack, Martin Wagner, Hannes Kenngott, Beat Müller-Stich, Lena Maier-Hein, Rüdiger Dillmann, Stefanie Speidel
PURPOSE: A key component of computer- assisted surgery systems is the accurate and robust registration of preoperative planning data with intraoperative sensor data. In laparoscopic surgery, this image-based registration remains challenging due to soft tissue deformations. This paper presents a novel approach for biomechanical soft tissue registration of preoperative CT data with stereo endoscopic image data. METHODS: The proposed method consists of two registrations steps...
May 26, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28522795/risk-factors-for-hepatic-venous-outflow-obstruction-in-piggyback-liver-transplantation-the-role-of-recipient-s-pattern-of-hepatic-veins-drainage-into-the-inferior-vena-cava
#4
Qifa Ye, Cheng Zeng, Yanfeng Wang, Zhehong Fang, Xiaoyan Hu, Yan Xiong, Ling Li
BACKGROUND The recipient's pattern of hepatic veins (HVs) drainage into the inferior vena cava (IVC) (drainage pattern, for short) may influence outflow reconstruction and thus hepatic venous outflow obstruction (HVOO) in piggyback liver transplantation (PBLT). However, no previous study has investigated this association. MATERIAL AND METHODS A retrospective analysis of 202 PBLT (2000-2016) was conducted. Based on drainage patterns, the patients were divided into Group A (common trunk of left and middle HVs), Group B (common trunk of right and middle HVs), and Group C (common trunk of 3 HVs)...
May 19, 2017: Annals of Transplantation: Quarterly of the Polish Transplantation Society
https://www.readbyqxmd.com/read/28513922/impact-of-sampling-interval-in-training-data-acquisition-on-intrafractional-predictive-accuracy-of-indirect-dynamic-tumor-tracking-radiotherapy
#5
Nobutaka Mukumoto, Mitsuhiro Nakamura, Mami Akimoto, Yuki Miyabe, Kenji Yokota, Yukinori Matsuo, Takashi Mizowaki, Masahiro Hiraoka
PURPOSE: To explore the effect of sampling interval of training data acquisition on the intrafractional prediction error of surrogate signal-based dynamic tumor-tracking using a gimbal-mounted linac. MATERIALS AND METHODS: Twenty pairs of respiratory motions were acquired from 20 patients (ten lung, five liver, and five pancreatic cancer patients) who underwent dynamic tumor-tracking with the Vero4DRT. First, respiratory motions were acquired as training data for an initial construction of the prediction model before the irradiation...
May 17, 2017: Medical Physics
https://www.readbyqxmd.com/read/28447108/split-bolus-intravenous-contrast-material-injection-vs-single-bolus-injection-in-patients-following-endovascular-abdominal-aortic-repair-evar
#6
Johannes Boos, Vassilios Raptopoulos, Alexander Brook, Olga R Brook
PURPOSE: To investigate the feasibility and accuracy of a split-bolus contrast injection CTA (SB-CTA) compared to a single-bolus injection CTA (SI-CTA) protocol of post-EVAR patients. MATERIALS AND METHODS: In this IRB-approved study, patients who underwent SB-CTA and SI-CTA after EVAR were evaluated. Attenuation and contrast-to-noise ratio (CNR) of vessels and parenchymal organs were assessed. Subjective enhancement of vessels, quality of 3D reconstructions, and enhancement phase of parenchymal organs were assessed by two independent readers...
April 26, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28426148/three-dimensional-finite-element-based-deformable-image-registration-for-evaluation-of-pleural-cavity-irradiation-during-photodynamic-therapy
#7
Rozhin Penjweini, Michele M Kim, Timothy C Zhu
PURPOSE: Photodynamic therapy (PDT) is used after surgical resection to treat the microscopic disease for malignant pleural mesothelioma and to increase survival rates. As accurate light delivery is imperative to PDT efficacy, the deformation of the pleural volume during the surgery is studied on its impact on the delivered light fluence. In this study, a three-dimensional finite element-based (3D FEM) deformable image registration is proposed to directly match the volume of lung to the volume of pleural cavity obtained during PDT to have accurate representation of the light fluence accumulated in the lung, heart and liver (organs-at-risk) during treatment...
April 20, 2017: Medical Physics
https://www.readbyqxmd.com/read/28387698/noise-indices-adjusted-to-body-mass-index-and-an-iterative-reconstruction-algorithm-maintain-image-quality-on-low-dose-contrast-enhanced-liver-ct
#8
Yongxia Zhao, Hongna Suo, Yanmin Wu, Ziwei Zuo, Sisi Zhao, Shujie Cheng
OBJECTIVES: Since body mass index (BMI) affects medical imaging quality or noise due to penetration of the radiation through bodies with varying sizes, this study aims to investigate and determine the optimal BMI-adjusted noise index (NI) setting on the contrast-enhanced liver CT scans obtained using 3D Smart mA technology with adaptive statistical iterative reconstruction (ASIR 2.0) algorithm. MATERIALS AND METHODS: A total of 320 patients who had contrast-enhanced liver CT scans were divided into two equal-sized groups: A (18...
April 5, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/28348481/hyperplasia-vs-hypertrophy-in-tissue-regeneration-after-extensive-liver-resection
#9
Fabio Marongiu, Michela Marongiu, Antonella Contini, Monica Serra, Erika Cadoni, Riccardo Murgia, Ezio Laconi
AIM: To address to what extent hypertrophy and hyperplasia contribute to liver mass restoration after major tissue loss. METHODS: The ability of the liver to regenerate is remarkable on both clinical and biological grounds. Basic mechanisms underlying this process have been intensively investigated. However, it is still debated to what extent hypertrophy and hyperplasia contribute to liver mass restoration after major tissue loss. We addressed this issue using a genetically tagged system...
March 14, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28332211/a-multichannel-block-matching-denoising-algorithm-for-spectral-photon-counting-ct-images
#10
Adam P Harrison, Ziyue Xu, Amir Pourmorteza, David A Bluemke, Daniel J Mollura
PURPOSE: We present a denoising algorithm designed for a whole-body prototype photon-counting computed tomography (PCCT) scanner with up to 4 energy thresholds and associated energy-binned images. METHODS: Spectral PCCT images can exhibit low signal to noise ratios (SNRs) due to the limited photon counts in each simultaneously-acquired energy bin. To help address this, our denoising method exploits the correlation and exact alignment between energy bins, adapting the highly-effective block-matching 3D (BM3D) denoising algorithm for PCCT...
March 23, 2017: Medical Physics
https://www.readbyqxmd.com/read/28290711/visualising-a-rare-and-complex-case-of-advanced-hilar-cholangiocarcinoma
#11
Jia Qu, Albert Fung, Paul Kelly, Gordon Tait, Paul D Greig, Anne Agur, Ian D McGilvray, Jodie Jenkinson
The Toronto Video Atlas of Liver, Pancreas, Biliary, and Transplant Surgery (TVASurg) is a free online library of three-dimensional (3D) animation-enhanced surgical videos, designed to instruct surgical fellows in hepato-pancreato-biliary (HPB) and transplant procedures. The video 'Klatskin tumours: Extended left hepatectomy with complex portal vein reconstruction and in situ cold perfusion of the liver', which is available to watch at http://TVASurg.ca , is a unique and valuable visual resource for surgeons in training to assist them in learning this rare procedure...
January 2017: Journal of Visual Communication in Medicine
https://www.readbyqxmd.com/read/28282642/shape-aware-surface-reconstruction-from-sparse-3d-point-clouds
#12
Florian Bernard, Luis Salamanca, Johan Thunberg, Alexander Tack, Dennis Jentsch, Hans Lamecker, Stefan Zachow, Frank Hertel, Jorge Goncalves, Peter Gemmar
The reconstruction of an object's shape or surface from a set of 3D points plays an important role in medical image analysis, e.g. in anatomy reconstruction from tomographic measurements or in the process of aligning intra-operative navigation and preoperative planning data. In such scenarios, one usually has to deal with sparse data, which significantly aggravates the problem of reconstruction. However, medical applications often provide contextual information about the 3D point data that allow to incorporate prior knowledge about the shape that is to be reconstructed...
February 14, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/28260170/usefulness-of-3d-balanced-turbo-field-echo-mr-sequence-evaluating-the-branching-pattern-of-the-intrahepatic-bile-ducts-comparison-with-drip-infusion-ct-cholangiography
#13
Masaki Ogawa, Yoshiyuki Ozawa, Kengo Ohta, Tomoya Sekiguchi, Shingo Omata, Misugi Urano, Yoichi Matsuo, Yuta Shibamoto
PURPOSE: For liver surgery, it is crucial to preoperatively examine the course of the right posterior bile duct. While MR cholangiopancreatography (MRCP) can only visualize the bile ducts, 3D balanced turbo-field-echo (BTFE) sequence clearly depicts the bile ducts and portal veins as well as drip infusion CT cholangiography (DIC-CT), without contrast media. We evaluated whether BTFE could substitute for DIC-CT. MATERIALS AND METHODS: Thirty patients undergoing MRCP and BTFE on 1...
March 4, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28207950/simplifying-volumes-of-interest-vois-definition-in-quantitative-spect-beyond-manual-definition-of-3d-whole-organ-vois
#14
Esther M Vicente, Martin A Lodge, Steven P Rowe, Richard L Wahl, Eric C Frey
PURPOSE: We investigated the feasibility of using simpler methods than manual whole-organ volume-of-interest (VOI) definition to estimate the organ activity concentration in single photon emission computed tomography (SPECT) in cases where the activity in the organ can be assumed to be uniformly distributed on the scale of the voxel size. In particular, we investigated an anatomic region-of-interest (ROI) defined in a single transaxial slice, and a single sphere placed inside the organ boundaries...
May 2017: Medical Physics
https://www.readbyqxmd.com/read/28122521/neovascularization-of-hepatocellular-carcinoma-in-a-nude-mouse-orthotopic-liver-cancer-model-a-morphological-study-using-x-ray-in-line-phase-contrast-imaging
#15
Beilei Li, Yiqiu Zhang, Weizhong Wu, Guohao Du, Liang Cai, Hongcheng Shi, Shaoliang Chen
BACKGROUND: This study aimed to determine whether synchrotron radiation (SR)-based X-ray in-line phase-contrast imaging (IL-PCI) can be used to investigate the morphological characteristics of tumor neovascularization in a liver xenograft animal model. METHODS: A human hepatocellular carcinoma HCCLM3 xenograft model was established in nude mice. Xenografts were sampled each week for 4 weeks and fixed to analyze tissue characteristics and neovascularization using SR-based X-ray in-line phase contrast computed tomography (IL-XPCT) without any contrast agent...
January 25, 2017: BMC Cancer
https://www.readbyqxmd.com/read/28048171/su-f-j-164-a-simulation-study-on-anovel-4d-mri-reconstruction-method-based-on-probability-driven-sorting
#16
X Liang, F Yin, Y Liu, J Cai
PURPOSE: To evaluate a novel probability-driven sorting based 4D MRI reconstruction method by comparing with the conventional 4D MRI reconstruction methods. METHODS: We have proposed a novel probability-driven sorting based 4D MRI reconstruction method capable of retaining breathing variation information in breathing signals by generating multiple breathing cycles instead of a single cycle as the case with conventional 4D MRI reconstruction methods. It is expected that our proposed method can reduce motion artifacts caused by breathing variations, and can generate more accurate Average Intensity Projections (AIP)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047598/su-f-j-158-respiratory-motion-resolved-self-gated-4d-mri-using-rotating-cartesian-k-space-sampling
#17
F Han, Z Zhou, Y Yang, K Sheng, P Hu
PURPOSE: Dynamic MRI has been used to quantify respiratory motion of abdominal organs in radiation treatment planning. Many existing 4D-MRI methods based on 2D acquisitions suffer from limited slice resolution and additional stitching artifacts when evaluated in 3D(1) . To address these issues, we developed a 4D-MRI (3D dynamic) technique with true 3D k-space encoding and respiratory motion self-gating. METHODS: The 3D k-space was acquired using a Rotating Cartesian K-space (ROCK) pattern, where the Cartesian grid was reordered in a quasi-spiral fashion with each spiral arm rotated using golden angle(2) ...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047559/th-ef-207a-01-respiratory-motion-correction-in-4d-multi-pinhole-small-animal-spect
#18
M Naseri, H Rajabi, J Wang, F Kalantari
PURPOSE: Respiration causes lesion smearing, image blurring and quality degradation, affecting lesion contrast and the ability to define correct lesion size. The spatial resolution of current multi pinhole SPECT (MPHS) scanners is sub-millimeter. Therefore, the effect of motion is more noticeable in comparison to conventional SPECT scanner. Gated imaging aims to reduce motion artifacts. A major issue in gating is the lack of statistics and individual reconstructed frames are noisy. The increased noise in each frame, deteriorates the quantitative accuracy of the MPHS Images...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047403/su-f-j-224-impact-of-4d-pet-ct-on-percist-classification-of-lung-and-liver-metastases-in-nslc-and-colorectal-cancer
#19
J Meier, B Lopez, O Mawlawi
PURPOSE: To quantify the impact of 4D PET/CT on PERCIST metrics in lung and liver tumors in NSCLC and colorectal cancer patients. METHODS: 32 patients presenting lung or liver tumors of 1-3 cm size affected by respiratory motion were scanned on a GE Discovery 690 PET/CT. The bed position with lesion(s) affected by motion was acquired in a 12 minute PET LIST mode and unlisted into 8 bins with respiratory gating. Three different CT maps were used for attenuation correction: a clinical helical CT (CT_clin), an average CT (CT_ave), and an 8-phase 4D CINE CT (CT_cine)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047328/mo-fg-campus-jep3-05-evaluation-of-4d-ct-on-rails-target-localization-methods-for-free-breathing-liver-stereotactic-body-radiotherapy-sbrt
#20
J Fan, T Lin, L Jin, L Chen, I Veltchev, L Wang, A Eldib, O Chibani, B Wang, Q Xu, R Price, C Ma
PURPOSE: Liver SBRT patients unable to tolerate breath-hold for radiotherapy are treated free-breathing with image guidance. Target localization using 3D CBCT requires extra margins to accommodate the respiratory motion. The purpose of this study is to evaluate the accuracy and reproducibility of 4D CT-on-rails in target localization for free-breathing liver SBRT. METHODS: A Siemens SOMATOM CT-on-Rails 4D with Anzai Pressure Belt system was used both as the simulation and the localization CT...
June 2016: Medical Physics
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