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liver 3D reconstruction

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https://www.readbyqxmd.com/read/28048171/su-f-j-164-a-simulation-study-on-anovel-4d-mri-reconstruction-method-based-on-probability-driven-sorting
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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-3d-reconstruction-in-ultrasound-elastography-via-a-sparse-iteration-based-on-markov-random-fields
#9
Atul Ingle, Tomy Varghese, William Sethares
Percutaneous needle-based liver ablation procedures are becoming increasingly common for treatment of small isolated tumors in hepatocellular carcinoma patients who are not candidates for surgery. Rapid three dimensional 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...
November 29, 2016: 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
#10
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 models of cirrhosis in rats were examined thoroughly. 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
https://www.readbyqxmd.com/read/27908164/comparison-of-low-contrast-detectability-between-two-ct-reconstruction-algorithms-using-voxel-based-3d-printed-textured-phantoms
#11
Justin Solomon, Alexandre Ba, François Bochud, Ehsan Samei
PURPOSE: To use novel voxel-based 3D printed textured phantoms in order to compare low-contrast detectability between two reconstruction algorithms, FBP (filtered-backprojection) and SAFIRE (sinogram affirmed iterative reconstruction) and determine what impact background texture (i.e., anatomical noise) has on estimating the dose reduction potential of SAFIRE. METHODS: Liver volumes were segmented from 23 abdominal CT cases. The volumes were characterized in terms of texture features from gray-level co-occurrence and run-length matrices...
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27889104/three-dimensional-reconstruction-of-the-embryonic-pancreas-in-the-grass-snake-natrix-natrix-l-lepidosauria-serpentes-based-on-histological-studies
#12
Magdalena Kowalska, Mateusz Hermyt, Weronika Rupik
The aim of this study was to evaluate two research hypotheses: H0-the embryonic pancreas in grass snakes develops in the same manner as in all previously investigated amniotes (from three buds) and its topographical localization within the adult body has no relation to its development; H1-the pancreas develops in a different manner and is related to the different topography of internal organs in snakes. For the evaluation of these hypotheses we used histological methods and three-dimensional (3D) reconstructions of the position of the pancreatic buds and surrounding organs at particular developmental stages and of the final position and shape of the pancreatic gland...
November 11, 2016: Zoology: Analysis of Complex Systems, ZACS
https://www.readbyqxmd.com/read/27791997/stem-cells-and-vascular-regenerative-medicine
#13
J-F Stoltz, D Bensoussan, N De Isla, L Zhang, Z Han, J Magdalou, C Huselstein, J S Ye, N Li, V Decot, L Reppel
Most human tissues do not regenerate spontaneously, which is why "cell therapy" are promising alternative treatments. The Principe is simple: patients' or donors' cells are collected and introduced into the injured tissues or organs directly or in a porous 3D material, with or without modification of their properties. This concept of regenerative medicine is an emerging field which can be defined as "the way to improve health and quality of life by restoring, maintaining, or enhancing tissue and organ functions"...
October 27, 2016: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/27733321/human-hepatocytes-loaded-in-3d-bioprinting-generate-mini-liver
#14
Cheng Zhong, Hai-Yang Xie, Lin Zhou, Xiao Xu, Shu-Sen Zheng
BACKGROUND: Because of an increasing discrepancy between the number of potential liver graft recipients and the number of organs available, scientists are trying to create artificial liver to mimic normal liver function and therefore, to support the patient's liver when in dysfunction. 3D printing technique meets this purpose. The present study was to test the feasibility of 3D hydrogel scaffolds for liver engineering. METHODS: We fabricated 3D hydrogel scaffolds with a bioprinter...
October 2016: Hepatobiliary & Pancreatic Diseases International: HBPD INT
https://www.readbyqxmd.com/read/27716273/a-clinical-combined-gadobutrol-bolus-and-slow-infusion-protocol-enabling-angiography-inversion-recovery-whole-heart-and-late-gadolinium-enhancement-imaging-in-a-single-study
#15
Animesh Tandon, Lorraine James, Markus Henningsson, René M Botnar, Amanda Potersnak, Gerald F Greil, Tarique Hussain
BACKGROUND: The use of gadolinium contrast agents in cardiovascular magnetic resonance is well-established and serves to improve both vascular imaging as well as enable late gadolinium enhancement (LGE) imaging for tissue characterization. Currently, gadofosveset trisodium, an intravascular contrast agent, combined with a three-dimensional inversion recovery balanced steady state free precession (3D IR bSSFP) sequence, is commonly used in pediatric cardiac imaging and yields excellent vascular imaging, but cannot be used for late gadolinium enhancement...
October 5, 2016: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/27616447/efficient-non-arterialized-mouse-liver-transplantation-using-3d-printed-instruments
#16
Graziano Oldani, Stéphanie Lacotte, Lorenzo A Orci, Vaihere Delaune, Florence Slits, Quentin Gex, Philippe Morel, Laura Rubbia-Brandt, Christian Toso
BACKGROUND: Due to the wide availability of genetically modified animals, mouse orthotopic liver transplantation is often preferred over rat liver transplantation. We present a simplified mouse liver transplantation technique, and compare transplantation outcomes with versus without hepatic artery anastomosis. METHODS: Instruments for liver implantation were designed and 3D-printed. The suprahepatic vena cava anastomosis was performed with 10-0 running suture. The vena porta and infrahepatic vena cava were joined on extraluminal cuffs, using the 3D-printed device for spatial alignment and stabilisation...
September 12, 2016: Liver Transplantation
https://www.readbyqxmd.com/read/27595838/coronal-2d-mr-cholangiography-overestimates-the-length-of-the-right-hepatic-duct-in-liver-transplantation-donors
#17
Bohyun Kim, Kyoung Won Kim, So Yeon Kim, So Hyun Park, Jeongjin Lee, Gi Won Song, Dong-Hwan Jung, Tae-Yong Ha, Sung Gyu Lee
PURPOSE: To compare the length of the right hepatic duct (RHD) measured on rotatory coronal 2D MR cholangiography (MRC), rotatory axial 2D MRC, and reconstructed 3D MRC. MATERIALS AND METHODS: Sixty-seven donors underwent coronal and axial 2D projection MRC and 3D MRC. RHD length was measured and categorized as ultrashort (≤1 mm), short (>1-14 mm), and long (>14 mm). The measured length, frequency of overestimation, and the degree of underestimation between two 2D MRC sets were compared to 3D MRC...
September 5, 2016: European Radiology
https://www.readbyqxmd.com/read/27587215/-application-of-three-dimensional-visualization-technology-in-surgical-treatment-for-patients-with-hepatic-alveolar-echinococcosis
#18
Y B He, L Bai, T Li, X W Ji, Aji Tuerganaili, Y Jiang, J M Zhao, Y M Shao, W Y Liu, H Wen
OBJECTIVE: To determine the clinical value of three-dimensional(3D) visualization technology in pre-operative assessment and surgical planning for patients with hepatic alveolar echinococcosis. METHODS: Eighty-five hepatic alveolar echinococcosis patients received surgical treatment in the First Affiliated Hospital of Xinjiang Medical University between May 2011 and May 2015.3D reconstruction and virtual surgeries were performed on diseased livers using a 3D visualization reconstruction system for liver, which based on the data set of 64-slice CT from those patients and indicated the feasibility and safety of liver resection...
September 1, 2016: Zhonghua Wai Ke za Zhi [Chinese Journal of Surgery]
https://www.readbyqxmd.com/read/27587214/-application-of-three-dimensional-visualization-technique-in-pediatric-living-donor-liver-transplantation
#19
Y Luo, M Zhang, T Zhou, J J Zhang, Q Xia
OBJECTIVE: To investigate the value of three-dimensional(3D) visualization technology for donor evaluation in pediatric living donor liver transplantation(LDLT). METHODS: The clinical data of 348 familial donors who underwent LDLT from January 2013 to December 2015 in Renji Hospital, Shanghai Jiaotong University School of Medicine were reviewed retrospectively.3D visualize-vascular type and liver grafts volume were analyzed and compared to the actual volume and anatomy...
September 1, 2016: Zhonghua Wai Ke za Zhi [Chinese Journal of Surgery]
https://www.readbyqxmd.com/read/27587213/-significance-of-three-dimensional-reconstruction-as-a-method-of-preoperative-planning-of-laparoscopic-radiofrequency-ablation
#20
W W Zhang, H G Wang, X J Shi, M Y Chen, S C Lu
OBJECTIVE: To discuss the significance of three-dimensional reconstruction as a method of preoperative planning of laparoscopic radiofrequency ablation(LRFA). METHODS: Thirty-two cases of LRFA admitted from January 2014 to December 2015 in Department of Hepatobiliary Surgery, Chinese People's Liberation Army General Hospital were analyzed(3D-LRFA group). Three-dimensional(3D) reconstruction were taken as a method of preoperative planning in 3D-LRFA group.Other 64 LRFA cases were paired over the same period without three-dimensional reconstruction before the operation (LRFA group)...
September 1, 2016: Zhonghua Wai Ke za Zhi [Chinese Journal of Surgery]
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