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https://www.readbyqxmd.com/read/28540778/ex-vivo-optimisation-of-a-heterogeneous-speed-of-sound-model-of-the-human-skull-for-non-invasive-transcranial-focused-ultrasound-at-1%C3%A2-mhz
#1
L Marsac, D Chauvet, R La Greca, A-L Boch, K Chaumoitre, M Tanter, J-F Aubry
Transcranial brain therapy has recently emerged as a non-invasive strategy for the treatment of various neurological diseases, such as essential tremor or neurogenic pain. However, treatments require millimetre-scale accuracy. The use of high frequencies (typically ≥1 MHz) decreases the ultrasonic wavelength to the millimetre scale, thereby increasing the clinical accuracy and lowering the probability of cavitation, which improves the safety of the technique compared with the use of low-frequency devices that operate at 220 kHz...
March 7, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28540400/imaging-of-cerebral-ischemic-edema-and-neuronal-death
#2
REVIEW
Rüdiger von Kummer, Imanuel Dzialowski
PURPOSE: In acute cerebral ischemia, the assessment of irreversible injury is crucial for treatment decisions and the patient's prognosis. There is still uncertainty how imaging can safely differentiate reversible from irreversible ischemic brain tissue in the acute phase of stroke. METHODS: We have searched PubMed and Google Scholar for experimental and clinical papers describing the pathology and pathophysiology of cerebral ischemia under controlled conditions...
May 24, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28540211/delayed-enhancement-cardiac-computed-tomography-for-the-assessment-of-myocardial-infarction-from-bench-to-bedside
#3
REVIEW
Gaston A Rodriguez-Granillo
A large number of studies support the increasingly relevant prognostic value of the presence and extent of delayed enhancement (DE), a surrogate marker of fibrosis, in diverse etiologies. Gadolinium and iodinated based contrast agents share similar kinetics, thus leading to comparable myocardial characterization with cardiac magnetic resonance (CMR) and cardiac computed tomography (CT) at both first-pass perfusion and DE imaging. We review the available evidence of DE imaging for the assessment of myocardial infarction (MI) using cardiac CT (CTDE), from animal to clinical studies, and from 16-slice CT to dual-energy CT systems (DECT)...
April 2017: Cardiovascular Diagnosis and Therapy
https://www.readbyqxmd.com/read/28539884/the-analysis-of-two-bdnf-polymorphisms-g196a-c270t-in-chinese-sporadic-amyotrophic-lateral-sclerosis
#4
Lianping Xu, Danyang Tian, Jiao Li, Lu Chen, Lu Tang, Dongsheng Fan
Amyotrophic lateral sclerosis (ALS) is an ethnically heterogeneous motor neuron disease that results from the selective death of motor neurons in the brain and spinal cord. Brain-derived neurotrophic factor (BDNF) is widely distributed across the central and peripheral nervous systems and plays neurotrophic and other physiological roles in various brain regions. Alterations of neurotrophin availability have been proposed as a pathogenic mechanism underlying ALS neurodegeneration. Several genetic studies have shown a significant association between schizophrenia, Alzheimer's disease, and Parkinson's disease and certain BDNF polymorphisms, specifically G196A (rs6265) and C270T (rs56164415)...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28536967/optimization-of-diagnostic-performance-for-differentiation-of-recurrence-from-radiation-necrosis-in-patients-with-metastatic-brain-tumors-using-tumor-volume-corrected-11-c-methionine-uptake
#5
Tae-Young Jung, In-Young Kim, Sa-Hoe Lim, Ki Seong Park, Dong-Yeon Kim, Shin Jung, Kyung-Sub Moon, Woo-Youl Jang, Sae-Ryung Kang, Sang-Geon Cho, Jung-Joon Min, Hee-Seung Bom, Seong Young Kwon
BACKGROUND: Tumor to normal tissue ratio (T/N ratio) on (11)C-methionine ((11)C-MET) positron emission tomography/computed tomography (PET/CT) is affected by variable factors. We investigated whether T/N ratio cutoff values corrected according to metabolic tumor volume (MTV) could improve the diagnostic performance of (11)C-MET PET/CT for diagnosis of recurrence in patients with metastatic brain tumor. Forty-eight patients with metastatic brain tumors underwent (11)C-MET PET/CT for differential diagnosis between recurrence and radiation necrosis after gamma knife radiosurgery (GKR)...
December 2017: EJNMMI Research
https://www.readbyqxmd.com/read/28536064/analysis-of-delayed-intracerebral-hemorrhage-associated-with-deep-brain-stimulation-surgery
#6
Chang Kyu Park, Na Young Jung, Min Soo Kim, Jin Woo Chang
OBJECTIVE: Deep brain stimulation (DBS) may cause various complications, including intracerebral hemorrhage (ICH). Because ICH causes devastating neurological outcomes, various surgical techniques are attempting to reduce the chances of ICH. More importantly, early detection and proper management of postoperative ICH are indispensable. ICH may occur immediate or delayed following DBS; in this study, we analyzed the clinical features of delayed ICH after DBS. METHODS: Patients (n=272) underwent postoperative brain computed tomography (CT) immediately after and 1 day after DBS between January 2008 and November 2016...
May 20, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28535635/-evaluation-of-ct-guided-iodine-125-seeds-brachytherapy-for-intracranial-malignant-tumors-under-control-of-target-and-dose
#7
X K Hu, L J Peng, S F Liu, K X Zhang, Y S Liu, F J Zhang, X D Zhu, X Z Gong, Y Gao, D F Wang, Z X Tina, Zixiang Li
Objective: To assess the efficacy and safety of CT-guided iodine-125 seeds in the treatment of intracranial malignancies under control of target and dose. Methods: From November 2003 to May 2016, with the clinical data of 412 operations on 310 patients in 12 hospitals in the past 14 years, this study analyzed the method of CT guided iodine-125 particles brachytherapy in the treatment of intracranial malignant tumors and evaluated the efficacy and complications. Stratification analysis of intracranial malignant tumors was performed...
May 23, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28535114/association-of-pd-1-5-c-t-but-not-pd-1-3-g-a-with-malignant-and-benign-brain-tumors-in-iranian-patients
#8
Fatemeh Namavar Jahromi, Morteza Samadi, Zahra Mojtahedi, Mohammad Reza Haghshenas, Mosa Taghipour, Nasrollah Erfani
Programmed death-1 (PD-1) negatively regulates the immune response. The aims of this study were to assess the association of two single nucleotide polymorphisms in the PD-1 gene, PD-1.5 (+7785 C/T-rs2227981) and PD-1.3 (+7146 G/A- rs11568821), with benign and malignant brain tumors. Patients with brain tumors (96 patients with benign and 56 with malignant brain tumors) and 150 healthy control individuals were included. PCR-RFLP was performed for genotyping. It was revealed that the genotype and allele frequencies of PD-1...
May 23, 2017: Immunological Investigations
https://www.readbyqxmd.com/read/28533856/-hydatid-cyst-of-the-posterior-fossa
#9
Abderrazzak El Saqui, Mohamed Aggouri, Mohamed Benzagmout, Khaled Chakour, Mohamed El Faizchaoui
Hydatidosis is an endemic affection in Morocco. Cerebral echinococcosis is a relatively rare entity accounting for only 1-2% of all hydatid cysts in humans. hydatid cyst of the posterior fossa is a very uncommon site for the disease. We report the case of a 12 year-old child admitted for high intracranial pressure. Brain CT scan showed a posterior fossa cyst without enhancement after contrast medium injection. Operative finding revealed a hydatid cyst. The histological examination of the tissue sample confirmed the diagnosis...
2017: Pan African Medical Journal
https://www.readbyqxmd.com/read/28533826/a-novel-triage-tool-optic-nerve-sheath-diameter-in-traumatic-brain-injury-and-its-correlation-to-rotterdam-computed-tomography-ct-scoring
#10
Sudha Kiran Das, Sachin P Shetty, Kamal Kumar Sen
BACKGROUND: Optic nerve sheath diameter (ONSD) evaluated in CT imaging as well as Rotterdam CT Score (RCTS) are proven independent predictors of outcome in patients with traumatic brain injury (TBI). To date, no study has correlated ONSD on admission CT scan with RCTS. MATERIAL/METHODS: Retrospective cohort study comprised of consecutive patients undergoing CT imaging for traumatic brain injury recruited between January and October 2015. Bilateral ONSD was measured 3 mm behind the eyeball in axial and sagittal planes and mean value was calculated...
2017: Polish Journal of Radiology
https://www.readbyqxmd.com/read/28533655/-18-f-fdg-pet-ct-in-localizing-additional-cns-lesion-in-a-case-of-langerhans-cell-histiocytosis-determining-accurate-extent-of-the-disease
#11
Shamim Ahmed Shamim, Sarthak Tripathy, Anirban Mukherjee, Chandrasekhar Bal, Madhavi Tripathi
Central nervous system involvement is a rare manifestation of Langerhans cell histiocytosis (LCH), with bone and skin lesions being more frequent. MR remains the investigation of choice for localizing brain lesions. However, due to poor sensitivity of MRI in detecting osseous and pulmonary lesions, it is not used routinely in staging purposes until and unless indicated. We hereby discuss a case of 6-year-old boy of LCH who was referred for 18-F-FDG PET/CT for staging and knowing the extent of the disease, but a lesion in hypothalamus was picked up incidentally on FDG PET-CT study that was confirmed by MRI...
April 2017: Indian Journal of Nuclear Medicine: IJNM: the Official Journal of the Society of Nuclear Medicine, India
https://www.readbyqxmd.com/read/28533646/image-findings-of-rare-case-of-peritoneal-carcinomatosis-from-non-small-cell-lung-cancer-and-response-to-erlotinib-in-f-18-fdg-positron-emission-tomography-computed-tomography
#12
Koramadai Karuppusamy Kamaleshwaran, Jephy Joseph, Radha Krishnan Kalarikal, Ajit Sugunan Shinto
Lung cancer is currently one of the most common malignancies in the world. Metastatic disease is observed in ~ 40% of patients with lung cancer, with the most common sites of metastasis being the bone, liver, brain and adrenal glands. Peritoneal carcinomatosis (PC) is defined as the progression of the primary cancer to the peritoneum. PC is a rare clinical event in lung cancer. Tyrosine kinase inhibitors targeting the epidermal growth factor receptor (EGFR), such as erlotinib are used for the treatment of patients with advanced non-small cell lung cancer (NSCLC)...
April 2017: Indian Journal of Nuclear Medicine: IJNM: the Official Journal of the Society of Nuclear Medicine, India
https://www.readbyqxmd.com/read/28533639/metastatic-brachial-plexopathy-with-brain-and-spinal-metastasis-in-a-case-of-recurrent-breast-carcinoma-demonstrated-on-18-f-fdg-pet-ct
#13
Sunny J Gandhi, Bhavdeep Rabadiya
We report a case of a 56-year-old woman diagnosed with infiltrating ductal carcinoma of the left breast, who had undergone left modified radical mastectomy followed by radiotherapy and adjuvant chemotherapy. FDG PET-CT showed metastatic brachial plexopathy with intra-spinal and extra-axial brain metastasis. Metastatic brachial plexopathy along with brain and spinal metastasis is a rare condition with very less incidence. The scan also showed left para-sternal anterior chest wall recurrence with antero-superior mediastinal metastasis...
April 2017: Indian Journal of Nuclear Medicine: IJNM: the Official Journal of the Society of Nuclear Medicine, India
https://www.readbyqxmd.com/read/28531828/ct-and-mri-based-door-needle-times-for-acute-stroke-patients-a-quasi-randomized-clinical-trial
#14
Christine Krarup Hansen, Anders Christensen, Helen Rodgers, Inger Havsteen, Christina Kruuse, Janus Nybing, Mari-Anne Kaasbøl, Hanne Christensen
Door-Needle-times (DNT) of 20min are feasible when Computer Tomography (CT) is used for first-line brain-imaging to assess stroke-patients' eligibility for intravenous-tissue-Plasminogen-Activator (iv-tPA), but the more time-consuming Magnetic Resonance Imaging (MRI)-based-evaluation is superior in detecting acute ischaemia.
May 10, 2017: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/28530209/reproducible-3d-printed-head-tanks-for-electrical-impedance-tomography-with-realistic-shape-and-conductivity-distribution
#15
James Avery, Kirill Aristovich, Barney Low, David Holder
OBJECTIVE: Electrical impedance tomography (EIT) has many promising applications in brain injury monitoring. To evaluate both instrumentation and reconstruction algorithms, experiments are first performed in head tanks. Existing methods, whilst accurate, produce a discontinuous conductivity, and are often made by hand, making it hard for other researchers to replicate. APPROACH: We have developed a method for constructing head tanks directly in a 3D printer. Conductivity was controlled through perforations in the skull surface, which allow for saline to pass through...
May 22, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28530158/analyzing-circle-of-willis-blood-flow-in-ischemic-stroke-patients-through-3d-stroke-arterial-flow-estimation
#16
Aichi Chien, Fernando Viñuela
Background The objective of ischemic stroke (IS) treatment is to achieve revascularization in cerebral arteries to restore blood flow. However, there is no available method to extract arterial flow data from clinical CTA images. We developed 3D Stroke Arterial Flow Estimation (SAFE), which provides blood flow data throughout the Circle of Willis based on 3D CTA and allows comparison of arterial flow distribution in the brain. Methods We implemented a newly developed 3D vascular reconstruction algorithm for clinical stroke CTA images...
January 1, 2017: Interventional Neuroradiology
https://www.readbyqxmd.com/read/28527587/relationship-between-carotid-computed-tomography-dual-energy-and-brain-leukoaraiosis
#17
Luca Saba, Roberto Sanfilippo, Antonella Balestrieri, Fulvio Zaccagna, Giovanni Maria Argiolas, Jasjit S Suri, Roberto Montisci
BACKGROUND: The purpose of this study was to assess if there is a correlation between the carotid computed tomography (CT) Hounsfield unit (HU)-based plaque attenuation values measured using dual-energy CT (DECT) scanner and brain leukoaraiosis (LA). METHODS: Fifty consecutive patients (34 males, 16 females; mean age, 69 years; age range, 46-84 years) who underwent carotid CT and brain magnetic resonance imaging were included in the study. CT examinations were performed with a DECT scanner, and LA lesion volume quantification was performed using a semiautomated segmentation technique...
May 17, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28527090/stroke-like-attack-first-episode-of-sporadic-hemiplegic-migraine
#18
Enrico Ferrante, Valentina Prone, Marco Longoni, Elio Clemente Agostoni
Hemiplegic migraine (HM) is a rare migraine with aura; it can be familiar or sporadic. A 46-years-old man presented left migraine followed by right hemiparesis with bilateral plantar flexion of cutaneous plantar reflex (CPR). Brain CT and CT-angiography were normal. The next day patient got worse. The EEG showed left fronto-temporal cuspidate delta waves and brain MRI showed a minimal hyperintensity at T2-sequences in the left frontal cortex with a minor representation of the cortical veins at susceptibility weighted imaging sequences...
May 2017: Neurological Sciences
https://www.readbyqxmd.com/read/28526667/patient-centered-decision-support-formative-usability-evaluation-of-integrated-clinical-decision-support-with-a-patient-decision-aid-for-minor-head-injury-in-the-emergency-department
#19
Edward R Melnick, Erik P Hess, George Guo, Maggie Breslin, Kevin Lopez, Anthony J Pavlo, Fuad Abujarad, Seth M Powsner, Lori A Post
BACKGROUND: The Canadian Computed Tomography (CT) Head Rule, a clinical decision rule designed to safely reduce imaging in minor head injury, has been rigorously validated and implemented, and yet expected decreases in CT were unsuccessful. Recent work has identified empathic care as a key component in decreasing CT overuse. Health information technology can hinder the clinician-patient relationship. Patient-centered decision tools to support the clinician-patient relationship are needed to promote evidence-based decisions...
May 19, 2017: Journal of Medical Internet Research
https://www.readbyqxmd.com/read/28526235/zero-echo-time-mri-only-treatment-planning-for-radiation-therapy-of-brain-tumors-after-resection
#20
C Boydev, B Demol, D Pasquier, H Saint-Jalmes, G Delpon, N Reynaert
Using magnetic resonance imaging (MRI) as the sole imaging modality for patient modeling in radiation therapy (RT) is a challenging task due to the need to derive electron density information from MRI and construct a so-called pseudo-computed tomography (pCT) image. We have previously published a new method to derive pCT images from head T1-weighted (T1-w) MR images using a single-atlas propagation scheme followed by a post hoc correction of the mapped CT numbers using local intensity information. The purpose of this study was to investigate the performance of our method with head zero echo time (ZTE) MR images...
May 16, 2017: Physica Medica: PM
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