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intraoperative MRI

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https://www.readbyqxmd.com/read/28205308/fast-and-robust-multimodal-image-registration-using-a-local-derivative-pattern
#1
Dongsheng Jiang, Yonghong Shi, Xinrong Chen, Manning Wang, Zhijian Song
PURPOSE: Deformable multimodal image registration, which can benefit radiotherapy and image guided surgery by providing complementary information, remains a challenging task in the medical image analysis field due to the difficulty of defining a proper similarity measure. This article presents a novel, robust and fast binary descriptor, the discriminative local derivative pattern (dLDP), which is able to encode images of different modalities into similar image representations. METHODS: dLDP calculates a binary string for each voxel according to the pattern of intensity derivatives in its neighborhood...
February 2017: Medical Physics
https://www.readbyqxmd.com/read/28202379/comprehensive-preoperative-work-up-and-surgical-treatment-of-low-grade-tumor-benign-lesion-related-temporal-lobe-epilepsy
#2
Rui Feng, Jie Hu, Jinsong Wu, Liqin Lang, Chengxin Ma, Shize Jiang, Bing Sun, Xin Gu, Li Pan
OBJECTIVE: Generally low-grade tumor/benign lesion related temporal lobe epilepsy (LGT/BL-TLE) is considered easier to treat and has better prognosis when compared to non-lesional TLE. However, multiple disputes exist in surgical management of this epilepsy entity. This study aims to discuss comprehensive preoperative work-up, surgical strategies and outcome of it. METHODS: A retrospective review of sixty LGT/BL-TLE cases which underwent comprehensive preoperative work-up and then resective surgeries was conducted...
February 12, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28199993/intraoperative-thresholds-for-capsular-stimulation-are-reliable-for-chronic-pallidal-deep-brain-stimulation-in-dystonia
#3
René Reese, Martin M Reich, Daniela Falk, Günther Deuschl, H Maximilian Mehdorn, Jens Volkmann
BACKGROUND: The threshold current for inducing muscle contractions by stimulation of pyramidal tract fibres adjacent to the globus pallidus internus (GPi) is, besides microelectrode recordings for the determination of nuclear boundaries, currently the only neurophysiological marker for intraoperative refinement of the anatomically planned target point for pallidal deep brain stimulation (GPi-DBS) in dystonia. OBJECTIVES: To determine the relationship between intraoperative thresholds for muscle contractions under general anaesthesia and postoperative thresholds in GPi-DBS...
February 16, 2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28194732/late-post-avr-progression-of-bicuspid-aortopathy-link-to-hemodynamics
#4
Shiho Naito, Tatiana Gross, Kushtrim Disha, Yskert von Kodolitsch, Hermann Reichenspurner, Evaldas Girdauskas
BACKGROUND AND AIM OF THE STUDY: The ascending aortic dilatation may progress after aortic valve replacement (AVR) in bicuspid aortic valve (BAV) patients. Our aim was to evaluate rheological flow patterns and histological characteristics of the aneurysmal aorta in BAV patients at the time of reoperative aortic surgery. MATERIALS AND METHODS: 13 patients (mean age: 42 ± 9 years, 10 (77%) male) with significant progression of proximal aortopathy after isolated AVR surgery for BAV disease (i...
February 13, 2017: General Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28186470/image-guidance-based-on-mri-for-spinal-interstitial-laser-thermotherapy-technical-aspects-and-accuracy
#5
Claudio E Tatsui, Clarissa N G Nascimento, Dima Suki, Behrang Amini, Jing Li, Amol J Ghia, Jonathan G Thomas, R Jason Stafford, Laurence D Rhines, Juan P Cata, Ashok J Kumar, Ganesh Rao
OBJECTIVE Image guidance for spinal procedures is based on 3D-fluoroscopy or CT, which provide poor visualization of soft tissues, including the spinal cord. To overcome this limitation, the authors developed a method to register intraoperative MRI (iMRI) of the spine into a neuronavigation system, allowing excellent visualization of the spinal cord. This novel technique improved the accuracy in the deployment of laser interstitial thermal therapy probes for the treatment of metastatic spinal cord compression...
February 10, 2017: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/28181025/surgical-management-of-chiari-i-malformation-based-on-different-cerebrospinal-fluid-flow-patterns-at-the-cranial-vertebral-junction
#6
Tao Fan, HaiJun Zhao, XinGang Zhao, Cong Liang, YinQian Wang, QiFei Gai
Chiari I malformation has been shown to present different cerebrospinal fluid (CSF) flow patterns at the cranial-vertebral junction (CVJ). Posterior fossa decompression is the first-line treatment for symptomatic Chiari I malformation. However, there is still controversy on the indication and selection of decompression procedures. This research aims to investigate the clinical indications, outcomes, and complications of the decompression procedures as alternative treatments for Chiari I malformation, based on the different CSF flow patterns at the cranial-vertebral junction...
February 9, 2017: Neurosurgical Review
https://www.readbyqxmd.com/read/28179198/cesarean-scar-ectopic-pregnancy-laparoscopic-resection-and-total-scar-dehiscence-repair-a-case-report
#7
Sara Mahgoub, Victor Gabriele, Emilie Faller, Bruno Langer, Arnaud Wattiez, Lise Lecointre, Cherif Akladios
STUDY OBJECTIVE: Illustrate laparoscopic technique for resection of cesarean scar ectopic pregnancy, associated with isthmocele repair. DESIGN: Case report SETTING: Tertiary referral centre in Strasbourg, France. The study was approved by the local IRB. BACKGROUND: Cesarean scar pregnancy is a rare form of ectopic pregnancy. The major risk of this type of pregnancy is the early uterine rupture with massive bleeding and maternal life-threatening...
February 4, 2017: Journal of Minimally Invasive Gynecology
https://www.readbyqxmd.com/read/28168343/is-infection-the-possible-initiator-of-disc-disease-an-insight-from-proteomic-analysis
#8
S Rajasekaran, Chitraa Tangavel, Siddharth N Aiyer, Sharon Miracle Nayagam, M Raveendran, Naveen Luke Demonte, Pramela Subbaiah, Rishi Kanna, Ajoy Prasad Shetty, K Dharmalingam
STUDY DESIGN: Proteomic and 16S rDNA analysis of disc tissues obtained in vivo. OBJECTIVE: To address the controversy of infection as an aetiology for disc disorders through protein profiling. There is raging controversy over the presence of bacteria in human lumbar discs in vivo, and if they represent contamination or infection. Proteomics can provide valuable insight by identifying proteins signifying bacterial presence and, also host defence response proteins (HDRPs), which will confirm infection...
February 6, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28166142/detection-and-viability-of-colorectal-liver-metastases-after-neoadjuvant-chemotherapy-a-multiparametric-pet-ct-mri-study
#9
Vincent Dunet, Nermin Halkic, John O Prior, Anass Anaye, Reto A Meuli, Christine Sempoux, Alban Denys, Sabine Schmidt
PURPOSE: The aim of this study was to compare combined gadolinium-ethoxybenzyl-diethylenetriamine-pentaacetic acid (Gd-EOB-DTPA)-enhanced and diffusion-weighted (DW) MRI with IV contrast-enhanced F-FDG PET/CT to detect and assess the viability of colorectal liver metastases (CLMs) after neoadjuvant chemotherapy (NAC). PATIENTS AND METHODS: After NAC, 45 patients with CLMs were prospectively enrolled and underwent combined Gd-EOB-DTPA-enhanced and DW-MRI and contrast-enhanced F-FDG PET/CT...
February 3, 2017: Clinical Nuclear Medicine
https://www.readbyqxmd.com/read/28154911/comparative-performance-of-non-contrast-mri-with-haste-vs-contrast-enhanced-mri-3d-mrcp-for-possible-choledocholithiasis-in-hospitalized-patients
#10
Stella K Kang, Laura Heacock, Ankur M Doshi, Justin R Ream, Jeffrey Sun, James S Babb
PURPOSE: To compare the performance of non-contrast MRI with half-Fourier acquisition single-shot turbo spin echo (HASTE) vs. contrast-enhanced MRI/3D-MRCP for assessment of suspected choledocholithiasis in hospitalized patients. METHODS AND MATERIALS: 123 contrast-enhanced abdominal MRI/MRCP scans in the hospital setting for possible choledocholithiasis were retrospectively evaluated. Endoscopic retrograde cholangiopancreatography, intraoperative cholangiogram or documented clinical resolution served as the reference standard...
February 2, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28149924/deformable-image-registration-for-tissues-with-large-displacements
#11
Xishi Huang, Jing Ren, Anwar Abdalbari, Mark Green
Image registration for internal organs and soft tissues is considered extremely challenging due to organ shifts and tissue deformation caused by patients' movements such as respiration and repositioning. In our previous work, we proposed a fast registration method for deformable tissues with small rotations. We extend our method to deformable registration of soft tissues with large displacements. We analyzed the deformation field of the liver by decomposing the deformation into shift, rotation, and pure deformation components and concluded that in many clinical cases, the liver deformation contains large rotations and small deformations...
January 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28144210/intestinal-intussusception-etiology-diagnosis-and-treatment
#12
REVIEW
Priscilla Marsicovetere, S Joga Ivatury, Brent White, Stefan D Holubar
Intussusception is defined as the invagination of one segment of the bowel into an immediately adjacent segment of the bowel. Idiopathic ileocolic intussusception is the most common form in children and is typically managed with nonoperative reduction via pneumatic and/or hydrostatic enemas. In the adult population, intussusception is uncommon and occurs more often in the small intestine than in the colon. It is associated with lead point pathology in most symptomatic cases presenting as bowel obstruction. When lead point pathology is present in adult small bowel intussusception, it is usually benign, though when malignant it is most frequently due to diffuse metastatic disease, for example, melanoma...
February 2017: Clinics in Colon and Rectal Surgery
https://www.readbyqxmd.com/read/28138771/l5-corpectomy-the-lumbosacral-segmental-geometry-and-clinical-outcome-a-consecutive-series-of-14-patients-and-review-of-the-literature
#13
Martin Vazan, Yu-Mi Ryang, Julia Gerhardt, Felix Zibold, Insa Janssen, Florian Ringel, Jens Gempt, Bernhard Meyer
PURPOSE: We analyzed the lumbosacral segmental geometry and clinical outcome in patients undergoing L5 corpectomy. METHODS: Fourteen consecutive patients who underwent L5 (n = 12) or L4 + 5 (n = 2) corpectomy at our department between January 2010 and April 2015 were included. All patients underwent a baseline physical and neurologic examination on admission. The diagnostic routine included MRI and CT scans and, if possible, an upright X-ray of the lumbar spine before and after surgery...
January 31, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28137548/intraoperative-mr-imaging-of-cerebral-oxygen-metabolism-during-resection-of-brain-lesions
#14
REVIEW
Andreas Stadlbauer, Andreas Merkel, Max Zimmermann, Björn Sommer, Michael Buchfelder, Anke Meyer-Bäse, Karl Rössler
OBJECTIVE: Tissue oxygen tension is an important parameter for brain tissue viability and its non-invasive intraoperative monitoring in the whole brain is of highly clinical relevance. The purpose of this study was the introduction of a multiparametric quantitative blood oxygenation dependent (qBOLD) MRI approach for intraoperative examination of oxygen metabolism during the resection of brain lesions. METHODS: Sixteen patients suffering from brain lesions were intraoperatively examined twice (before craniotomy and after gross-total resection) using the qBOLD technique and a 1...
January 27, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28133346/-a-case-of-schwannoma-originating-from-the-sciatic-nerve
#15
Yohei Nose, Atsushi Naito, Takeshi Kato, Ryota Mori, Yasuo Oneda, Tomo Ishida, Ryuichi Kuwahara, Takuya Sakamoto, Kohei Murakami, Yoshiteru Katsura, Yoshiaki Ohmura, Yoshinori Kagawa, Atsushi Takeno, Yutaka Takeda, Shigeyuki Tamura
A 75-year-old man was admitted with abdominal pain and taken to our hospital. CT and MRI showed a tumor measuring 60mm in diameter in the pelvic cavity. Based on the imaging findings, we suspected a schwannoma and decided to perform surgery. As the tumor was found to be benign in intraoperative frozen section diagnosis, the tumor was enucleated. Histopathological findings showed no nuclear atypia, and the patient was diagnosed with a schwannoma. He complained of paresthesia in his right leg after surgery, and underwent walking training...
November 2016: Gan to Kagaku Ryoho. Cancer & Chemotherapy
https://www.readbyqxmd.com/read/28133292/-a-case-of-angiomyolipoma-occurring-in-the-mesentery-of-the-transverse-colon-and-treated-using-laparoscopic-excision
#16
Masashi Inoue, Masahiro Tanemura, Nobutaka Hatanaka, Tatsuya Miyamoto, Shingo Seo, Megumi Yamaguchi, Toshihiro Misumi, Wataru Shimizu, Toshimitsu Irei, Takashi Onoe, Takahisa Suzuki, Takeshi Sudo, Yosuke Shimizu, Takao Hinoi, Hirotaka Tashiro
A 65-year-old woman had received chemotherapy for malignant lymphoma since 2011. After the 8th course, computed tomography revealed the disappearance of lymph node metastasis, except for 22mm of the mass located on the tail side of the antrum. MRI showed a low intensity mass on the T1 and T2-weighted images. FDG-PET did not show abnormal uptake in the tumor. EUS-FNA did not reveal a definitive diagnosis. We performed a laparotomy for diagnosis and treatment. Intraoperative findings showed that the tumor occurred in the mesentery of the transverse colon...
November 2016: Gan to Kagaku Ryoho. Cancer & Chemotherapy
https://www.readbyqxmd.com/read/28133240/-a-case-of-primary-peritoneal-cancer-successfully-treated-with-debulking-surgery-and-postoperative-chemotherapy
#17
Koki Maeda, Masami Tabata, Taiki Moriyama, Tatsuya Sakamoto, Yu Fujimura, Ichiro Ohsawa, Kenji Kato, Makoto Iwata, Takayuki Sanda
A 52-year-old woman with abdominal pain and a feeling of incomplete evacuation visited a local clinic. Enlargement of the right ovary was detected, and the patient was referred to the gynecological department of our hospital. CT and MRI revealed a round-shaped mass, 8 cm in diameter, with cystic and solid components in the Douglas pouch. The patient underwent a laparotomy under the diagnosis of ovarian cancer. Intraoperatively, both the ovaries appeared normal and the tumor strongly adhered to the rectum and uterus...
November 2016: Gan to Kagaku Ryoho. Cancer & Chemotherapy
https://www.readbyqxmd.com/read/28126025/anti-inflammatory-properties-of-amniotic-membrane-patch-following-pericardiectomy-for-constrictive-pericarditis
#18
Katherine M Marsh, Alice S Ferng, Tia Pilikian, Ankit A Desai, Ryan Avery, Mark Friedman, Isabel Oliva, Clint Jokerst, David Schipper, Zain Khalpey
BACKGROUND: Since constrictive pericarditis is most often idiopathic and the pathophysiology remains largely unknown, both the diagnosis and the treatment can be challenging. However, by definition, inflammatory processes are central to this disease process. Amniotic membrane patches have been shown to possess anti-inflammatory properties and are believed to be immune privileged. Due to these properties, amniotic membrane patches were applied intraoperatively in a complicated patient presenting with constrictive pericarditis...
January 26, 2017: Journal of Cardiothoracic Surgery
https://www.readbyqxmd.com/read/28120090/radioguided-occult-lesion-localization-in-deep-schwannomas-of-the-peripheral-nerves-results-of-a-preliminary-case-series
#19
Giorgio Stevanato, Giovanni Monteleone, Donatella Sgubin, Michele Sicolo, Giulia Pastorello, Luca Vazzana, Franco Guida
BACKGROUND: The detection of small deep schwannomas of the peripheral nerves has been increasing since the the use of precise neuroimaging techniques has become more widespread; however, although nonpalpable lesions can be well defined by images, it is often difficult to identify them during the surgical procedure. The authors report seven cases of nonpalpable small deep schwannomas surgically treated after their identification using the radioguided occult lesion localization (ROLL) technique...
2017: Acta Neurochirurgica. Supplement
https://www.readbyqxmd.com/read/28120089/awake-craniotomy-for-tumor-resection-further-optimizing-therapy-of-brain-tumors
#20
H Maximilian Mehdorn, Felix Schwartz, Juliane Becker
In recent years more and more data have emerged linking the most radical resection to prolonged survival in patients harboring brain tumors. Since total tumor resection could increase postoperative morbidity, many methods have been suggested to reduce the risk of postoperative neurological deficits: awake craniotomy with the possibility of continuous patient-surgeon communication is one of the possibilities of finding out how radical a tumor resection can possibly be without causing permanent harm to the patient...
2017: Acta Neurochirurgica. Supplement
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