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three dimensional reconstruction

Taisuke Murata, Kenta Miwa, Noriaki Miyaji, Kei Wagatsuma, Tomoyuki Hasegawa, Keiichi Oda, Takuro Umeda, Takashi Iimori, Yoshitada Masuda, Takashi Terauchi, Mitsuru Koizumi
BACKGROUND: The point spread function (PSF) of positron emission tomography (PET) depends on the position across the field of view (FOV). Reconstruction based on PSF improves spatial resolution and quantitative accuracy. The present study aimed to quantify the effects of PSF correction as a function of the position of a traceable point-like (22)Na source over the FOV on two PET scanners with a different detector design. METHODS: We used Discovery 600 and Discovery 710 (GE Healthcare) PET scanners and traceable point-like (22)Na sources (<1 MBq) with a spherical absorber design that assures uniform angular distribution of the emitted annihilation photons...
December 2016: EJNMMI Physics
Pinar Cagimni, Figen Govsa, Mehmet Asim Ozer, Zuhal Kazak
OBJECTIVE: Different clinical problems may require a surgical approach to the dental arch, such as dentofacial orthopedics, implant-supported dental prothesis, maxillary orthodontics protraction, removable appliances, and posttraumatic dental reconstruction. The aim of this study is to analyze the dental arch size and type for supporting individual dental protheses. MATERIALS AND METHODS: In this study, the reference measurements on the length of the bony palate, maxillary intercanine width, maxillary intermolar width, and the ratio of the maxillary to the palatinal surface were studied in 120 bony palates using a computer software program...
October 25, 2016: Surgical and Radiologic Anatomy: SRA
Jeffrey G Trost, Lawrence O Lin, Sarah Jane Clark, David Y Khechoyan, Larry H Hollier, Edward P Buchanan
BACKGROUND: Conjoined twins are a rare medical phenomenon that offers a unique challenge for medical professionals. The complex anatomy of conjoined twins dictates their survival and amenability to separation, making each case different in terms of medical management, surgical planning, and patient outcomes. Thoraco-omphalo-ischiopagus twins, joined from the thorax to the pelvis, are one of the rarest orientations recorded in the medical literature, and successful separation of this subset of conjoined twins has not been documented...
November 2016: Plastic and Reconstructive Surgery
Ulrike Pilsl, Friedrich Anderhuber
BACKGROUND: The blood supply to the external nose is poorly described. The aim of this study was to identify the different types of blood supply to the external nose and the course of the arteries in relation to the nasolabial fold and groove and to the facial muscles. METHODS: With 96 facial halves of 48 adult specimens, the arteries of the outer nose were dissected, and three-dimensional computed tomographic reconstructions and horizontal sections were made. RESULTS: Three main types of blood supply to the external nose were identified, associated with the different types of facial arteries...
November 2016: Plastic and Reconstructive Surgery
T Doshi, C Wilson, C Paterson, C Lamb, A James, K MacKenzie, J Soraghan, L Petropoulakis, G Di Caterina, D Grose
AIMS: To carry out statistical validation of a newly developed magnetic resonance imaging (MRI) auto-contouring software tool for gross tumour volume (GTV) delineation in head and neck tumours to assist in radiotherapy planning. MATERIALS AND METHODS: Axial MRI baseline scans were obtained for 10 oropharyngeal and laryngeal cancer patients. GTV was present on 102 axial slices and auto-contoured using the modified fuzzy c-means clustering integrated with the level set method (FCLSM)...
October 22, 2016: Clinical Oncology: a Journal of the Royal College of Radiologists
S M Shah, J P Crawshaw, E S Boek
In the last decade, imaging techniques capable of reconstructing three-dimensional (3-D) pore-scale model have played a pivotal role in the study of fluid flow through complex porous media. In this study, we present advances in the application of confocal laser scanning microscopy (CLSM) to image, reconstruct and characterize complex porous geological materials with hydrocarbon reservoir and CO2 storage potential. CLSM has a unique capability of producing 3-D thin optical sections of a material, with a wide field of view and submicron resolution in the lateral and axial planes...
October 25, 2016: Journal of Microscopy
Jessica O Leasure, Jeffrey N Peck, Armando Villamil, Kara L Fiore, Cheryl A Tano
OBJECTIVE: To evaluate the inter- and intra-observer variability in measurement of the angle of lateral opening (ALO) and version angle measurement using digital radiography and computed tomography (CT). METHODS: Each hemipelvis was implanted with a cementless acetabular cup. Ventrodorsal and mediolateral radiographs were made of each pelvis, followed by CT imaging. After removal of the first cup, the pelves were implanted with an acetabular cup in the contralateral acetabulum and imaging was repeated...
October 25, 2016: Veterinary and Comparative Orthopaedics and Traumatology: V.C.O.T
Bo Jin, Yi-Bing Su, Ji-Zong Zhao
BACKGROUND: Although pedicle screw placement (PSP) is a well-established technique for spine surgery, the treatment of patients with primary invasive spinal tumor (PIST) has high surgical risks secondary to destroyed pedicles. Intraoperative three-dimensional fluoroscopy-based navigation (ITFN) system permits safe and accurate instrumentation of the spine with the advantage of obtaining intraoperative real-time three-dimensional images and automatic registration. The aim of this study is to evaluate the feasibility and accuracy of PSP using ITFN system for patients afflicted with PIST in the thoracic spine...
2016: Chinese Medical Journal
Ju Young Go, Bo Young Kang, Jin Hee Hwang, Kap Sung Oh
BACKGROUND: Efforts to prevent chest wall deformity after costal cartilage graft are ongoing. In this study, we introduce a new method to prevent donor site deformation using irradiated cadaver cartilage (ICC) and compare this method to the autogenous diced cartilage (ADC) technique. METHODS: Forty-two pediatric patients comprised the ADC group (n = 24) and the ICC group (n = 18). After harvesting costal cartilage, the empty perichondrial space was filled with autologous diced cartilage in the ADC group and cadaver cartilage in the ICC group...
September 23, 2016: Journal of Plastic, Reconstructive & Aesthetic Surgery: JPRAS
Jan L Bruse, Abbas Khushnood, Kristin McLeod, Giovanni Biglino, Maxime Sermesant, Xavier Pennec, Andrew M Taylor, Tain-Yen Hsia, Silvia Schievano
OBJECTIVES: Even after successful aortic coarctation repair, there remains a significant incidence of late systemic hypertension and other morbidities. Independently of residual obstruction, aortic arch morphology alone may affect cardiac function and outcome. We sought to uncover the relationship of arch 3-dimensional shape features with functional data obtained from cardiac magnetic resonance scans. METHODS: Three-dimensional aortic arch shape models of 53 patients (mean age, 22...
September 22, 2016: Journal of Thoracic and Cardiovascular Surgery
Rushin Shojaii, Anne L Martel
The registration of two-dimensional histology images to reference images from other modalities is an important preprocessing step in the reconstruction of three-dimensional histology volumes. This is a challenging problem because of the differences in the appearances of histology images and other modalities, and the presence of large nonrigid deformations which occur during slide preparation. This paper shows the feasibility of using densely sampled scale-invariant feature transform (SIFT) features and a SIFTFlow deformable registration algorithm for coregistering whole-mount histology images with blockface optical images...
October 2016: Journal of Medical Imaging
Wei-Bing Wu, Xin-Feng Xu, Wei Wen, Jing Xu, Quan Zhu, Liang Chen
Thoracoscopic anatomic pulmonary segmentectomy and subsegmentectomy have become sophisticated surgical solutions for complex pulmonary diseases. The rapid development of three-dimensional computed tomographic angiography (3DCTA) has made it possible to provide more refined individualized anatomic details and has consequently enabled subsubsegmentectomy (SSS). In this study, we report two successful thoracoscopic anatomic SSSs of the left S(1+2)aii and S(3)aii under the guidance of 3DCTA reconstructed images...
November 2016: Annals of Thoracic Surgery
J L Vilas, J Navas, J Gómez-Blanco, J M de la Rosa-Trevín, R Melero, I Peschiera, I Ferlenghi, J Cuenca, R Marabini, J M Carazo, J Vargas, C O S Sorzano
Random conical tilt (RCT) and orthogonal tilt reconstruction (OTR) are two remarkable methods for reconstructing the three-dimensional structure of macromolecules at low resolution. These techniques use two images at two different sample tilts. One of the most demanding steps in these methods at the image processing level is to identify corresponding particles on both micrographs, and manual or semiautomatic matching methods are usually used. Here we present an approach to solve this bottleneck with a fully automatic method for assigning particle tilt pairs...
October 18, 2016: Journal of Structural Biology
Juho Suojanen, Junnu Leikola, Patricia Stoor
The use of virtual surgery, patient-specific saw and drill guides, and custom-made osteosynthesis plates is rapidly spreading from deformity surgery to orthognathic surgery. Most of the commercially available systems are using computer-aided design/computer-aided manufacture (CAD/CAM) wafers to produce patient-specific saw guides. However, most plate systems provided are still the conventional "in stock" mini plates that can be individually designed by pre-bending according to the stereolithographic model of the patient...
September 23, 2016: Journal of Cranio-maxillo-facial Surgery
Kouhei Tajima, Nobuyuki Uchida, Hajime Sasamoto, Toshiyuki Okada, Takayuki Kohri, Akira Mogi, Hiroyuki Kuwano
A 69-year-old woman visited our hospital complaining of right chest pain. Chest computed tomography showed a 55 × 45 mm tumor in the right upper lobe. Bronchoscopy revealed displaced anomalous B (1) and B (2)(+3) arising from the right main bronchus, and the patient was diagnosed with lung adenocarcinoma by transbronchial lung biopsy from the displaced B (2)(+3) . Three-dimensional computed tomography with multiplanar reconstruction revealed a displaced anomalous B (1) and B (2)(+3) branching directly from the right main bronchus, respectively, and abnormal distribution of the aberrant pulmonary vein (V (2) ) descended dorsally to the right main bronchus and emptied into the left atrium...
September 2016: Thoracic Cancer
Sungheon Gene Kim, Melanie Freed, Ana Paula Klautau Leite, Jin Zhang, Claudia Seuss, Linda Moy
PURPOSE: To assess the diagnostic utility of contrast kinetic analysis for breast lesions and background parenchyma of women undergoing MRI-guided biopsies, for whom standard clinical analysis had failed to separate benign and malignant lesions. MATERIALS AND METHODS: This study included 115 women who had indeterminate lesions based on routine diagnostic breast MRI exams and underwent an MRI (3 Tesla) -guided biopsy of one or more lesions suspicious for breast cancer...
October 20, 2016: Journal of Magnetic Resonance Imaging: JMRI
Y Nouma, W Ben Amar, M Zribi, S Bardaa, Z Hammami, S Maatoug
We report a case of a Tunisian footballer who was found dead abroad under suspicious circumstances. The cause of death was, originally, attributed to a lightning strike. The corpse was buried without/autopsy. Over thirty years later, the family requested the exhumation to verify the identity and the cause of death. The exhumation was performed in 2011. DNA profiling from teeth and femur bone samples confirmed the identity of the deceased. The dry bone study revealed defects in the skull and the pelvis evoking firearm injuries...
October 11, 2016: Journal of Forensic and Legal Medicine
Akemi Koshiba, Taisuke Mori, Fumitake Ito, Yukiko Tanaka, Osamu Takaoka, Akiko Takahata, Jo Kitawaki
AIM: To assess and compare the uterine volume and endometrium length between women with and without endometriosis, using pelvic magnetic resonance imaging scans. METHODS: In this case-control study, a total of 75 nulligravid women (aged 20-45 years) with regular menstrual cycles whose uterus were free of any surgically confirmed lesions were enrolled. The endometriosis group underwent surgery for endometrioma (n = 39), and the control group underwent surgery for non-endometrioma ovarian cysts (n = 36)...
October 20, 2016: Journal of Obstetrics and Gynaecology Research
Nobuhiro Yada, Hideo Onishi, Masahiro Miyai, Kentarou Ozasa, Masuo Haramoto, Yasushi Yamamoto, Shuhei Yamaguchi, Hajime Kitagaki
PURPOSE: This study aimed to verify the resolution recovery for each collimator in the brain perfusion image. METHOD: To verify the effect of the resolution recovery for each collimator, we evaluated via the three-dimensional brain phantom (phantom) and the normal brain perfusion single photon emission computed tomography (SPECT) data. These data were reconstructed using the three-dimensional ordered subset expectation maximization method (3D-OSEM) (Evolution for bone(TM)) that was performed with scatter correction, attenuation correction, and resolution recovery (RR)...
2016: Nihon Hoshasen Gijutsu Gakkai Zasshi
Shawn P Reese, Niloofar Farhang, Randy Poulson, Gennie Parkman, Jeffrey A Weiss
In vitro polymerized type I collagen hydrogels have been used extensively as a model system for three-dimensional (3D) cell and tissue culture, studies of fibrillogenesis, and investigation of multiscale force transmission within connective tissues. The nanoscale organization of collagen fibrils plays an essential role in the mechanics of these gels and emergent cellular behavior in culture, yet quantifying 3D structure with nanoscale resolution to fully characterize fibril organization remains a significant technical challenge...
October 18, 2016: Biophysical Journal
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