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liver 3D reconstruction

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https://www.readbyqxmd.com/read/28447108/split-bolus-intravenous-contrast-material-injection-vs-single-bolus-injection-in-patients-following-endovascular-abdominal-aortic-repair-evar
#1
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
#2
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
#3
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
#4
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-multi-channel-block-matching-denoising-algorithm-for-spectral-photon-counting-ct-images
#5
Adam P Harrison, Ziyue Xu, David A Bluemke, Amir Pourmorteza, 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
#6
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
#7
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
#8
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
#9
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...
February 16, 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
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
https://www.readbyqxmd.com/read/28046479/we-ab-bra-05-pet-guided-delivery-quality-evaluation-of-yttrium-90-microsphere-radioembolizaton-for-hepatocellular-carcinoma-patients-the-optimal-sequence-of-radioembolizaton-and-chemoembolization-treatments
#16
M Lin, B Saboury
PURPOSE: Selective-internal-radiation-therapy (SIRT) and transarterial-chemoembolization (TACE) are commonly used for treatment of liver tumors. The use of TACE, which is macroembolic, prior to SIRT may cause hemodynamic changes in tumor vasculature that impair yttrium-90 (90Y) microsphere delivery to the targeted lesions. This work aims to quantify dosimetric tumor coverage using 90Y positron emission tomography (PET) dosimetry after SIRT alone compared to TACE followed by SIRT. METHODS: A total of 40 consecutive hepatocellular carcinoma (HCC) SIRT patients who had a post-SIRT 90Y PET/CT scan were evaluated...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046219/th-ef-bra-07-evaluation-of-internal-target-volume-derived-from-a-prototype-4d-mri-sequence-with-3d-radial-stack-of-stars-trajectory-and-k-space-self-gating
#17
W Yang, Z Fan, Z Deng, J Pang, X Bi, M Fenchel, D Li, B Fraass, B Hakimian, R Reznik, M Bryant, H Sandler, R Tuli
PURPOSE: 4D-MRI based on resorting of 2D-cine-MRI images shows great potential to assess tumor motion more accurately compared to 4D-CT, however, it suffers from low through-plane resolution and stitching artifacts. 4D-MRI based on 3D acquisition results in stitching-artifact-free images with high in-plane and through-plane resolutions. In this study, we report our early clinical experience of a prototype 4D-MRI sequence with 3D stack-of-stars (SOS) trajectory for internal target volume (ITV) definition...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/27995631/a-multilevel-framework-to-reconstruct-anatomical-3d-models-of-the-hepatic-vasculature-in-rat-livers
#18
Geert Peeters, Charlotte Debbaut, Wim Laleman, Diethard Monbaliu, Ingrid Vander Elst, Jan R Detrez, Tim Vandecasteele, Thomas De Schryver, Luc Van Hoorebeke, Kasper Favere, Jonas Verbeke, Patrick Segers, Pieter Cornillie, Winnok H De Vos
The intricate (micro)vascular architecture of the liver has not yet been fully unravelled. Although current models are often idealized simplifications of the complex anatomical reality, correct morphological information is instrumental for scientific and clinical purposes. Previously, both vascular corrosion casting (VCC) and immunohistochemistry (IHC) have been separately used to study the hepatic vasculature. Nevertheless, these techniques still face a number of challenges such as dual casting in VCC and limited imaging depths for IHC...
December 20, 2016: Journal of Anatomy
https://www.readbyqxmd.com/read/27913340/efficient-3-d-reconstruction-in-ultrasound-elastography-via-a-sparse-iteration-based-on-markov-random-fields
#19
Atul Ingle, Tomy Varghese, William A Sethares
Percutaneous needle-based liver ablation procedures are becoming increasingly common for the treatment of small isolated tumors in hepatocellular carcinoma patients who are not candidates for surgery. Rapid 3-D visualization of liver ablations has potential clinical value, because it can enable interventional radiologists to plan and execute needle-based ablation procedures with real time feedback. Ensuring the right volume of tissue is ablated is desirable to avoid recurrence of tumors from residual untreated cancerous cells...
March 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/27913222/human-liver-regeneration-in-advanced-cirrhosis-is-organized-by-the-portal-tree
#20
Katalin Dezső, András Rókusz, Edina Bugyik, Armanda Szücs, András Szuák, Bence Dorogi, Mátyás Kiss, Ágnes Nemeskéri, Péter Nagy, Sándor Paku
BACKGROUND & AIMS: In advanced cirrhosis new hepatocytic nodules are generated by budding of ductules in areas of parenchymal extinction. However, the vascular alterations in the areas of parenchymal extinction, the blood supply and the structure of the new hepatocytic nodules have not been analyzed in detail. METHODS: Explanted human cirrhotic livers of three different etiologies and two experimental rat models of cirrhosis were thoroughly examined. 3D reconstruction of the immunohistochemically stained serial sections and casting of human and experimental cirrhotic livers have been used to reveal the structural organization of the regenerative buds...
November 29, 2016: Journal of Hepatology
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