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Image Guidance

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https://www.readbyqxmd.com/read/28929364/anthropomorphic-liver-phantom-with-flow-for-multimodal-image-guided-liver-therapy-research-and-training
#1
Anna Rethy, Jørn Ove Sæternes, Jostein Halgunset, Ronald Mårvik, Erlend F Hofstad, Juan A Sánchez-Margallo, Thomas Langø
PURPOSE: The objective of this study was to develop a multimodal, permanent liver phantom displaying functional vasculature and common pathologies, for teaching, training and equipment development in laparoscopic ultrasound and navigation. METHODS: Molten wax was injected simultaneously into the portal and hepatic veins of a human liver. Upon solidification of the wax, the surrounding liver tissue was dissolved, leaving a cast of the vessels. A connection was established between the two vascular trees by manually manipulating the wax...
September 19, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28929215/needle-tip-visibility-in-3d-ultrasound-images
#2
Muhammad Arif, Adriaan Moelker, Theo van Walsum
AIM: Needle visibility is crucial for effective and safe ultrasound-guided interventional procedures. Several studies have investigated needle visibility in 2D ultrasound imaging, but less information is available for 3D ultrasound imaging, a modality that has great potential for image guidance interventions. We performed a prospective study, to quantitatively compare the echogenicity of various commercially available needles in 3D ultrasound images used in clinical practice under freehand needle introduction...
September 19, 2017: Cardiovascular and Interventional Radiology
https://www.readbyqxmd.com/read/28928084/follow-up-care-for-survivors-of-prostate-cancer-clinical-management-a-program-in-evidence-based-care-systematic-review-and-clinical-practice-guideline
#3
A Loblaw, L H Souter, C Canil, R H Breau, M Haider, L Jamnicky, R Morash, M Surchin, A Matthew
AIMS: This clinical practice guideline was developed to provide evidence-based guidance on the frequency by which prostate-specific antigen (PSA) levels should be tested in men after curative-intent treatment for prostate cancer and to define the most appropriate diagnostic testing if biochemical recurrence occurs. MATERIALS AND METHODS: An electronic search using OVID was used to systematically search the MEDLINE and EMBASE databases for systematic reviews and primary literature...
September 16, 2017: Clinical Oncology: a Journal of the Royal College of Radiologists
https://www.readbyqxmd.com/read/28927870/management-of-incidental-liver-lesions-on-ct-a-white-paper-of-the-acr-incidental-findings-committee
#4
Richard M Gore, Perry J Pickhardt, Koenraad J Mortele, Elliot K Fishman, Jeanne M Horowitz, Claus J Fimmel, Mark S Talamonti, Lincoln L Berland, Pari V Pandharipande
The ACR Committee on Incidental Findings presents recommendations for managing liver lesions that are incidentally detected on CT. These recommendations represent an update from the liver component of the ACR 2010 white paper on managing incidental findings in the pancreas, adrenal glands, kidneys, and liver. The Liver Subcommittee-which included five abdominal radiologists, one hepatologist, and one hepatobiliary surgeon-developed this algorithm. The recommendations draw from published evidence and expert opinion and were finalized by informal iterative consensus...
September 16, 2017: Journal of the American College of Radiology: JACR
https://www.readbyqxmd.com/read/28927740/comparative-evaluation-of-iodine-125-radioactive-seed-localization-and-wire-localization-for-resection-of-breast-lesions
#5
Vi Thuy Tran, Julie David, Erica Patocskai, Mathieu Zummo-Soucy, Rami Younan, Lucie Lalonde, Maude Labelle, Mona El Khoury, André Robidoux, Isabelle Trop
PURPOSE: Radioactive seed localization (RSL) uses a titanium seed labeled with iodine-125 energy for surgery of nonpalpable breast lesions. RSL facilitates radiology-surgery scheduling and allows for improved oncoplasty compared with wire localization (WL). The purpose of this work was to compare the 2 techniques. METHODS: We performed a retrospective study of all breast lesions operated with RSL between February 2013 and March 2015 at our university institution, and compared with an equivalent number of surgeries performed with a single WL...
September 15, 2017: Canadian Association of Radiologists Journal, Journal L'Association Canadienne des Radiologistes
https://www.readbyqxmd.com/read/28927209/intraoperative-imaging-in-traumatic-peripheral-nerve-lesions-correlating-histologic-cross-sections-with-high-resolution-ultrasound
#6
S Shelby Burks, Iahn Cajigas, Jean Jose, Allan D Levi
BACKGROUND: Intraoperative ultrasound (US) has been used as a guide during surgery to better identify deep neuroanatomical structures. OBJECTIVE: To correlate histologic cross-sections from nerve samples taken at the time of surgery with axial, high-resolution US images at similar locations and validate this important tool for intraoperative guidance in nerve surgery. METHODS: Three subjects undergoing nerve repair procedures after traumatic nerve injuries were enrolled prospectively...
April 1, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28926310/coronary-ct-angiography-derived-fractional-flow-reserve
#7
Christian Tesche, Carlo N De Cecco, Moritz H Albrecht, Taylor M Duguay, Richard R Bayer, Sheldon E Litwin, Daniel H Steinberg, U Joseph Schoepf
Invasive coronary angiography (ICA) with measurement of fractional flow reserve (FFR) by means of a pressure wire technique is the established reference standard for the functional assessment of coronary artery disease (CAD) ( 1 , 2 ). Coronary computed tomographic (CT) angiography has emerged as a noninvasive method for direct assessment of CAD and plaque characterization with high diagnostic accuracy compared with ICA ( 3 , 4 ). However, the solely anatomic assessment provided with both coronary CT angiography and ICA has poor discriminatory power for ischemia-inducing lesions...
October 2017: Radiology
https://www.readbyqxmd.com/read/28924524/retrospective-review-on-accuracy-a-pilot-study-of-robotically-guided-thoracolumbar-sacral-pedicle-screws-versus-fluoroscopy-guided-and-computerized-tomography-stealth-guided-screws
#8
Brian Fiani, Syed A Quadri, Vivek Ramakrishnan, Blake Berman, Yasir Khan, Javed Siddiqi
Introduction Pedicle screw insertion is the mainstay of thora-cic and lumbosacral posterior spinal instrumentation. However, it may be associated with complications such as screw mal-positioning. The purpose of this study was to develop a pilot study to compare the accuracy of robot-guided screw insertion versus hand-guided screw placement for spinal instrumentation. The hand-guided screws were placed with assistance from computerized tomography (CT) stealth guidance or fluoroscopy. Materials and methods A retrospective analysis of medical records was done for all patients that had pedicle screw insertion for instrumentation between the dates of December 2013 and January 2016 with post-screw placement CT imaging...
July 6, 2017: Curēus
https://www.readbyqxmd.com/read/28924006/the-neural-basis-of-aversive-pavlovian-guidance-during-planning
#9
Níall Lally, Quentin J M Huys, Neir Eshel, Paul Faulkner, Peter Dayan, Jonathan P Roiser
Important real-world decisions are often arduous as they frequently involve sequences of choices, with initial selections affecting future options. Evaluating every possible combination of choices is computationally intractable, particularly for longer multi-step decisions. Therefore, humans frequently employ heuristics to reduce the complexity of decisions. We recently used a goal-directed planning task to demonstrate the profound behavioral influence and ubiquity of one such shortcut, namely aversive pruning, a reflexive Pavlovian process that involves neglecting parts of the decision space residing beyond salient negative outcomes...
September 18, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28922117/magnetic-resonance-mediated-radiofrequency-ablation
#10
Yik-Kiong Hue, Alexander R Guimaraes, Ouri Cohen, Erez Nevo, Abraham Roth, Jerome L Ackerman, Jerome L Ackerman
OBJECTIVE: To introduce magnetic resonance mediated radiofrequency ablation (MR-RFA), in which the MRI scanner uniquely serves both diagnostic and therapeutic roles. In MR-RFA scanner-induced RF heating is channeled to the ablation site via a Larmor frequency RF pickup device and needle system, and controlled via the pulse sequence. METHODS: MR-RFA was evaluated with simulation of electric and magnetic fields to predict the increase in local specific-absorption-rate (SAR)...
September 18, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28920524/remotely-supported-prehospital-ultrasound-a-feasibility-study-of-real-time-image-transmission-and-expert-guidance-to-aid-diagnosis-in-remote-and-rural-communities
#11
Leila Eadie, John Mulhern, Luke Regan, Alasdair Mort, Helen Shannon, Ashish Macaden, Philip Wilson
Introduction Our aim is to expedite prehospital assessment of remote and rural patients using remotely-supported ultrasound and satellite/cellular communications. In this paradigm, paramedics are remotely-supported ultrasound operators, guided by hospital-based specialists, to record images before receiving diagnostic advice. Technology can support users in areas with little access to medical imaging and suboptimal communications coverage by connecting to multiple cellular networks and/or satellites to stream live ultrasound and audio-video...
January 1, 2017: Journal of Telemedicine and Telecare
https://www.readbyqxmd.com/read/28918798/new-imaging-techniques-endoscopic-ultrasound-guided-elastography
#12
REVIEW
Julio Iglesias-García, Jose Lariño-Noia, Juan Enrique Domínguez-Muñoz
Endoscopic ultrasound (EUS) is a major imaging method in the management of several diseases of the gastrointestinal tract and surrounding structures. Elastography is a novel technique providing additional information to standard B-mode imaging on the tissue stiffness. Elastography can be performed under EUS guidance. This method has proven to be an accurate and additional tool in the evaluation of pancreatic diseases and lymph nodes analysis. Possible uses include the study of liver lesions, subepithelial masses, and many more...
October 2017: Gastrointestinal Endoscopy Clinics of North America
https://www.readbyqxmd.com/read/28917276/stereotactic-biopsy-platforms-with-intraoperative-imaging-guidance
#13
REVIEW
Ahmed Mohyeldin, J Bradley Elder
The resolution and real-time navigation of intraoperative MRI (iMRI) has been leveraged in neurosurgery. We review frameless stereotactic biopsy platforms and focus on emerging technology integrating intraoperative MRI with frameless stereotaxy. Brain biopsy with iMRI allows for an accurate tissue sample with the ability to correct cannula trajectory during surgery, eliminating misdiagnosis secondary to faulty targeting. This technology allows for a percutaneous approach avoiding large incisions, obviates the need for frozen tissue evaluation, has the potential to reduce unnecessary specimen harvesting and operating room time, and optimizes safety of targeting deep brain lesions...
October 2017: Neurosurgery Clinics of North America
https://www.readbyqxmd.com/read/28917250/emerging-technologies-in-stereotactic-body-radiotherapy
#14
Lijun Ma, Lei Wang, Chia-Lin Tseng, Arjun Sahgal
Stereotactic body radiation therapy (SBRT) stems from the initial developments of intra-cranial stereotactic radiosurgery (SRS). Despite similarity in their names and clinical goals of delivering a sufficiently high tumoricidal dose, maximal sparing of the surrounding normal tissues and a short treatment course, SBRT technologies have transformed from the early days of body frame-based treatments with X-ray verification to primarily image-guided procedures with cone-beam CT or stereoscopic X-ray systems and non-rigid body immo-bilization...
September 2017: Chinese Clinical Oncology
https://www.readbyqxmd.com/read/28916508/development-of-a-whole-slide-imaging-system-on-smartphones-and-evaluation-with-frozen-section-samples
#15
Hong Yu, Feng Gao, Liren Jiang, Shuoxin Ma
BACKGROUND: The aim was to develop scalable Whole Slide Imaging (sWSI), a WSI system based on mainstream smartphones coupled with regular optical microscopes. This ultra-low-cost solution should offer diagnostic-ready imaging quality on par with standalone scanners, supporting both oil and dry objective lenses of different magnifications, and reasonably high throughput. These performance metrics should be evaluated by expert pathologists and match those of high-end scanners. OBJECTIVE: The aim was to develop scalable Whole Slide Imaging (sWSI), a whole slide imaging system based on smartphones coupled with optical microscopes...
September 15, 2017: JMIR MHealth and UHealth
https://www.readbyqxmd.com/read/28916344/image-guided-percutaneous-omental-and-mesenteric-biopsy-assessment-of-technical-success-rate-and-diagnostic-yield
#16
Harshna V Vadvala, Vanessa Fiorini Furtado, Avinash Kambadakone, Nathan E Frenk, Peter R Mueller, Ronald S Arellano
PURPOSE: To assess biopsy technique, technical success rate, and diagnostic yield of image-guided percutaneous biopsy of omental and mesenteric lesions. MATERIALS AND METHODS: This retrospective study included 186 patients (89 men, 97 women; mean [SD] age, 63 [13.8] y) who underwent percutaneous image-guided biopsy of omentum and mesentery between March 2007 and August 2015. Biopsies were performed with computed tomography (CT) (n = 172) or ultrasound (US) (n = 14) guidance using coaxial technique yielding core and fine-needle aspiration (FNA) specimens...
September 13, 2017: Journal of Vascular and Interventional Radiology: JVIR
https://www.readbyqxmd.com/read/28916139/online-adaptive-radiation-therapy
#17
REVIEW
Stephanie Lim-Reinders, Brian M Keller, Shahad Al-Ward, Arjun Sahgal, Anthony Kim
The current paradigm of radiation therapy has the treatment planned on a snapshot dataset of the patient's anatomy taken at the time of simulation. Throughout the course of treatment, this snapshot may vary from initial simulation. Although there is the ability to image patients within the treatment room with technologies such as cone beam computed tomography, the current state of the art is largely limited to rigid-body matching and not accounting for any geometric deformations in the patient's anatomy. A plan that was once attuned to the initial simulation can become suboptimal as the treatment progresses unless improved technologies are brought to bear...
April 24, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28915639/heptamethine-carbocyanine-dz-1-dye-for-near-infrared-fluorescence-imaging-of-hepatocellular-carcinoma
#18
Jiaze An, Ningning Zhao, Caiqin Zhang, Yong Zhao, Dengxu Tan, Ya Zhao, Bing Bai, Hai Zhang, Boyang Jason Wu, Changhong Shi
Near-infrared fluorescence (NIRF) dyes have recently emerged as promising tools for non-invasive imaging of different types of cancers. Here, we explored the potential utility of a NIRF DZ-1 dye, with dual imaging and tumour targeting functions, in hepatocellular carcinoma (HCC). We showed the preferential uptake of DZ-1 by HCC cells in vitro and in derived subcutaneous/orthotopic tumour xenografts, accompanied by a minimal effect on normal cells. DZ-1 simplified tumour growth profiling as well, since we were able to correlate NIRF signals with tumour volume and/or tumour-emitting luminescence in mice...
August 22, 2017: Oncotarget
https://www.readbyqxmd.com/read/28914343/image-guided-percutaneous-removal-of-ballistic-foreign-bodies-secondary-to-air-gun-injuries
#19
Jacob L Rothermund, Andrew J Rabe, Nicholas A Zumberge, James W Murakami, Patrick S Warren, Mark J Hogan
BACKGROUND: Ballistic injuries with retained foreign bodies from air guns is a relatively common problem, particularly in children and adolescents. If not removed in a timely fashion, the foreign bodies can result in complications, including pain and infection. Diagnostic methods to identify the presence of the foreign body run the entire gamut of radiology, particularly radiography, ultrasound (US) and computed tomography (CT). Removal of the foreign bodies can be performed by primary care, emergency, surgical, and radiologic clinicians, with or without imaging guidance...
September 15, 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/28914116/defining-a-core-outcome-set-for-adolescent-and-young-adult-patients-with-a-spinal-deformity
#20
Marinus de Kleuver, Sayf S A Faraj, Roderick M Holewijn, Niccole M Germscheid, Raphael D Adobor, Mikkel Andersen, Hans Tropp, Benny Dahl, Heli Keskinen, Anders Olai, David W Polly, Miranda L van Hooff, Tsjitske M Haanstra
Background and purpose - Routine outcome measurement has been shown to improve performance in several fields of healthcare. National spine surgery registries have been initiated in 5 Nordic countries. However, there is no agreement on which outcomes are essential to measure for adolescent and young adult patients with a spinal deformity. The aim of this study was to develop a core outcome set (COS) that will facilitate benchmarking within and between the 5 countries of the Nordic Spinal Deformity Society (NSDS) and other registries worldwide...
September 15, 2017: Acta Orthopaedica
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