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scanning imaging

Wilhelm H Flatz, Annika Henneberger, Maximilian F Reiser, Robert Gürkov, Birgit Ertl-Wagner
Analysis of neural structures in Menière's Disease (MD) is of importance, since a loss of such structures has previously been proposed for this patient group but has yet to be confirmed. This protocol describes a method of in vivo evaluation of neural changes especially well suitable for cranial nerve analysis using magnetic resonance imaging (MRI). MD-patients and normal hearing persons were examined in a 3-T MR-scanner using a scan protocol including strongly T2-weighted 3D gradient-echo-sequence (3D-CISS)...
February 21, 2018: Journal of Visualized Experiments: JoVE
Aida Niñerola-Baizán, Judith Gallego, Albert Cot, Pablo Aguiar, Francisco Lomeña, Javier Pavía, Domenec Ros
The aim of this work was to obtain a set of parameters to be applied in [123I]FP-CIT SPECT reconstruction in order to minimize the error between standardized and true values of the Specific Uptake Ratio (SUR) in dopaminergic neurotransmission SPECT studies. To this end, Monte Carlo simulation was used to generate a database of 1,380 projection data-sets from 23 subjects, including normal cases and a variety of pathologies. Studies were reconstructed using Filtered Back Projection (FBP) with attenuation correction and Ordered Subset Expectation Maximization (OSEM) with correction for different degradations (attenuation, scatter and PSF)...
March 19, 2018: Physics in Medicine and Biology
Habiba Hashimi, David T Cooke, Elizabeth A David, Lisa M Brown
Accurate staging for non-small cell lung cancer (NSCLC) is essential to guide therapy. While computed tomography (CT) and positron emission tomography (PET) scan can indicate whether mediastinal lymphadenopathy is present, histologic confirmation is required to complete the staging evaluation. Endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) is a minimally invasive technique associated with similar diagnostic yield and improved postoperative pain and complication rates compared to mediastinoscopy...
2018: Journal of Visualized Surgery
Abhilasha Siyag, Tej P Soni, Anil K Gupta, Lalit M Sharma, Naresh Jakhotia, Shantanu Sharma
Plasmacytoma of the skull-base is a rare entity. Differential diagnosis includes chordoma, osteosarcoma, carcinoma nasopharynx, meningioma, metastatic carcinoma, lymphoma, and multiple myeloma. Accurate and precise diagnosis is extremely important for plasmacytoma of the skull-base as its treatment and prognosis is different from other skull-base lesions. A 41-year-old man presented with concerns of headache, diplopia, and left eye strabismus. A magnetic resonance image (MRI) of his brain showed a large expansile mass measuring 51 mm involving the clivus and central skull-base...
January 15, 2018: Curēus
Muhammad Sohail Umerani, Hira Burhan, Salman Sharif, Tauqir Ul Islam, Mehak Hafiz Ghaziani
Orbital roof defects are rare congenital osseous abnormalities that cause protrusion of intracranial contents into the orbit, resulting in a condition known as the orbital meningoencephalocele, a rare cause of pulsatile proptosis. We present a case of a 25-year-old lady, presented to us with complaints of left frontal headache, left eye protrusion and double vision from the left eye for the past three months. Her higher mental functions were intact. Local examination revealed non-axial pulsatile proptosis and an outward depression of the left eyeball along with diplopia...
January 15, 2018: Curēus
John W Kakareka, Anthony Z Faranesh, Randall H Pursley, Adrienne Campbell-Washburn, Daniel A Herzka, Toby Rogers, Josh Kanter, Kanishka Ratnayaka, Robert J Lederman, Thomas J Pohida
Hemodynamic recording during interventional cardiovascular procedures is essential for procedural guidance, monitoring patient status, and collection of diagnostic information. Recent advances have made interventions guided by magnetic resonance imaging (MRI) possible and attractive in certain clinical scenarios. However, in the MRI environment, electromagnetic interference (EMI) can cause severe distortions and artifacts in acquired hemodynamic waveforms. The primary aim of this paper was to develop and validate a system to minimize EMI on electrocardiogram (ECG) and invasive blood pressure (IBP) signals...
2018: IEEE Journal of Translational Engineering in Health and Medicine
Thomas J Allen, Olumide Ogunlade, Edward Zhang, Paul C Beard
A laser scanning optical resolution photoacoustic microscopy (LS OR-PAM) system based on a stationary fibre optic sensor is described. The sensor comprises an optically resonant interferometric polymer cavity formed on the tip of a rounded single mode optical fibre. It provides low noise equivalent pressure (NEP = 68.7 Pa over a 20 MHz measurement bandwidth), a broad bandwidth that extends to 80 MHz and a near omnidirectional response. The latter is a significant advantage, as it allows large areas (>1cm2 ) to be imaged without the need for translational mechanical scanning offering the potential for fast image acquisition...
February 1, 2018: Biomedical Optics Express
Yang Zhao, Kengyeh K Chu, Will J Eldridge, Evan T Jelly, Michael Crose, Adam Wax
Speckle is an intrinsic noise of interferometric signals which reduces contrast and degrades the quality of optical coherence tomography (OCT) images. Here, we present a frequency compounding speckle reduction technique using the dual window (DW) method. Using the DW method, speckle noise is reduced without the need to acquire multiple frames. A ~25% improvement in the contrast-to-noise ratio (CNR) was achieved using the DW speckle reduction method with only minimal loss (~17%) in axial resolution. We also demonstrate that real-time speckle reduction can be achieved at a B-scan rate of ~21 frames per second using a graphic processing unit (GPU)...
February 1, 2018: Biomedical Optics Express
Kari V Vienola, Mathi Damodaran, Boy Braaf, Koenraad A Vermeer, Johannes F de Boer
Retinal motion detection with an accuracy of 0.77 arcmin corresponding to 3.7 µm on the retina is demonstrated with a novel digital micromirror device based ophthalmoscope. By generating a confocal image as a reference, eye motion could be measured from consecutively measured subsampled frames. The subsampled frames provide 7.7 millisecond snapshots of the retina without motion artifacts between the image points of the subsampled frame, distributed over the full field of view. An ophthalmoscope pattern projection speed of 130 Hz enabled a motion detection bandwidth of 65 Hz...
February 1, 2018: Biomedical Optics Express
Boy Braaf, Sabine Donner, Ahhyun S Nam, Brett E Bouma, Benjamin J Vakoc
Complex differential variance (CDV) provides phase-sensitive angiographic imaging for optical coherence tomography (OCT) with immunity to phase-instabilities of the imaging system and small-scale axial bulk motion. However, like all angiographic methods, measurement noise can result in erroneous indications of blood flow that confuse the interpretation of angiographic images. In this paper, a modified CDV algorithm that corrects for this noise-bias is presented. This is achieved by normalizing the CDV signal by analytically derived upper and lower limits...
February 1, 2018: Biomedical Optics Express
Alexander Mikhaylov, Sophie de Reguardati, Jüri Pahapill, Patrik R Callis, Bern Kohler, Aleksander Rebane
Fluorescent DNA base analogs and intrinsic fluorophores are gaining importance for multiphoton microscopy and imaging, however, their quantitative nonlinear excitation properties have been poorly documented. Here we present the two-photon absorption (2PA) spectra of 2-aminopurine (2AP), 7-methyl guanosine (7MG), isoxanthopterin (IXP), 6-methyl isoxanthopterin (6MI), as well as L-tryptophan (L-trp) and 3-methylindole (3MI) in aqueous solution and some organic solvents measured in the wavelength range 550 - 810 nm using femtosecond two-photon excited fluorescence (2PEF) and nonlinear transmission (NLT) methods...
February 1, 2018: Biomedical Optics Express
Zhang Li, Fan Huang, Jiong Zhang, Behdad Dashtbozorg, Samaneh Abbasi-Sureshjani, Yue Sun, Xi Long, Qifeng Yu, Bart Ter Haar Romeny, Tao Tan
Multi-modal retinal image registration is often required to utilize the complementary information from different retinal imaging modalities. However, a robust and accurate registration is still a challenge due to the modality-varied resolution, contrast, and luminosity. In this paper, a two step registration method is proposed to address this problem. Descriptor matching on mean phase images is used to globally register images in the first step. Deformable registration based on modality independent neighbourhood descriptor (MIND) method is followed to locally refine the registration result in the second step...
February 1, 2018: Biomedical Optics Express
Minhee Park, Ho Kyoung Hwang, Mijin Yun, Woo Jung Lee, Hoguen Kim, Chang Moo Kang
Objective: We aimed to investigate the metabolic characteristics of Solid pseudopapillary neoplasms (SPNs) in relation signal intensities on18 F-FDG PET scans. Summary Background Data: SPNs of the pancreas commonly show high uptake of 18F-FDG. However, the metabolic characteristics underlying the high18 F-FDG uptake in SPNs are not well characterized. Materials and Methods: mRNA expressions for glucose metabolism were analyzed in five SPNs, five pancreatic ductal adenocarcinomas (PCAs), and paired normal pancreatic tissues...
February 23, 2018: Oncotarget
Bradford Bennett, Drew Johnson, Andrew Panakos, Aleksandr Rozenberg
A 51-year-old woman with history of migraine headaches and intermittent nausea, vomiting, palpitations, and diaphoresis presented to the emergency department with hypertensive emergency 1 month after starting a beta blocker for migraine prophylaxis. Contrast-enhanced computed tomography of the chest incidentally revealed a large abdominal mass in the area of the left adrenal gland. Iodine-123 metaiodobenzylguanidine scan imaging showed localized uptake into the left adrenal gland. Along with imaging results, laboratory testing confirmed the diagnosis of pheochromocytoma...
February 2018: Radiology Case Reports
Hongbo Chang, Jianning Zhang, Weidong Cao, Yaming Wang, Hulin Zhao, Rui Liu, Shengli Guo
The present study evaluated drug distribution and clinical safety in treating patients with cystic craniopharyngioma (CP) with intracavitary radiotherapy using phosphorus-32 (32 P) colloid. In total, 40 patients who were recently diagnosed with primary or recurrent cystic CP were enrolled into the study. Patients underwent stereotactic intracavitary therapy and were administered32 P colloid and iopamidol-300 (1:1 dilution). Head computed tomography (CT) scans were performed 2 h after surgery in order to assess drug distribution and leakage...
April 2018: Oncology Letters
Couger Jimenez Jaramillo, John Wojcik, Kristy Weber, Ronnie Sebro
Pleomorphic hyalinizing angiectatic tumors (PHATs) are rare mesenchymal soft tissue tumors of uncertain lineage and intermediate malignancy. The present study assesses two cases of PHAT and discusses the histological and immunophenotypical features, as well as the imaging appearance of these tumors on ultrasound, computed tomography (CT), magnetic resonance imaging and positron emission tomography/CT scans. The current study also reviews the literature and discusses the clinical management of these tumors. Wide local excision with tumor free margins is the current recommended treatment for PHAT...
April 2018: Oncology Letters
Lamia AbedNoor Muhammed
Examining retinal image continuously plays an important role in determining human eye health; with any variation present in this image, it may be resulting from some disease. Therefore, there is a need for computer-aided scanning for retinal image to perform this task automatically and accurately. The fundamental step in this task is identification of the retina elements; optical disk localization is the most important one in this identification. Different optical disc localization algorithms have been suggested, such as an algorithm that would be proposed in this paper...
2018: International Journal of Biomedical Imaging
Hongchuan Guo, Xu Wang, Chunyu Song, Zihao Song, Jiantao Liang, Gang Song, Yuhai Bao
OBJECTIVE: To retrospectively analyze the clinical data of 4 patients with trigeminal neuralgia (TN) secondary to osteoid osteoma (OO) of petrous bone and discuss the treatment experiences for this rare disease. METHOD: Between January 2008 and December 2016, 4 patients diagnosed as TN secondary to OO of petrous bone received surgical treatment in Xuan Wu Hospital of Capital Medical University. We summarized the characteristics and treatment experiences of this rare disease through retrospective review of the clinical information, imaging features, surgical details and follow up outcomes of all those 4 patients...
March 15, 2018: World Neurosurgery
Michael Froehner, Steffen Jahn, Verena Plodeck, Michael Laniado, Manfred P Wirth
A 51-year old male patient presented with lower abdominal pain persisting since about one year. Abdominal computed tomography scan showed a solid tumor interpreted as urachal carcinoma with peritoneal carcinomatosis. Histopathological examination revealed urachal abscess. Awareness of clinical signs and imaging findings of this rare but characteristic condition may avoid emotional distress of patients associated with erroneous suspicion of malignancy.
March 15, 2018: Urology
Sung-Hoon Kim, Chan-Jin Park, Lee-Ra Cho, Yoon-Hyuk Huh
STATEMENT OF PROBLEM: Little information is available for the strength of bonding between zirconia and lithium disilicate as affected by surface pretreatment methods. PURPOSE: The purpose of this in vitro study was to investigate the shear bond strength (SBS) between zirconia core and lithium disilicate (LS2 ) veneered ceramic after surface pretreatments. MATERIAL AND METHODS: Fully sintered yttrium oxide partially stabilized tetragonal zirconia (Y-TZP) disk specimens were fabricated from zirconia ceramic materials...
March 15, 2018: Journal of Prosthetic Dentistry
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