Utilization of high resolution and low velocity encoding PCA with highly accelerated compressed sensing for preoperative SEEG planning
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It is essential to avoid small vessels during stereo-electroencephalography (SEEG) electrode implantation. In this study, we proposed a 6-fold Compressed sensing accelerated, 5cm/s Low velocity encoded, 0.75mm Isotropic resolution Phase contrast Magnetic Resonance Angiography (CLIP-MRA). In CLIP-MRA, the compressed sensing based acceleration method was shown to achieve better image quality or shorter scan duration compared to parallel imaging based acceleration. CLIP-MRA was able to display not only cortical arteries and veins simultaneously, but also vessels in the skull. Safety and effectiveness of CLIP-MRA utilized preoperative SEEG planning were evaluated on a small patient cohort.Keywords:
Stereoelectroencephalography
Magnetic resonance angiography
The present review focuses on the recent developments in the field of pulmonary angiography and perfusion by means of computed tomography and magnetic resonance imaging.Computed tomography allows for a detailed analysis of large and small pulmonary vascular pathologies and simultaneously allows for evaluation of the lung parenchyma. Magnetic resonance imaging allows for large and small vessel evaluation as well as noninvasive pressure assessment. Furthermore, recently non-breath-hold contrast-enhanced and noncontrast-enhanced techniques have been developed making magnetic resonance imaging an ideal tool for comprehensive thoracic imaging, even in challenging patients.Noninvasive imaging using computed tomography and magnetic resonance imaging further increases their value in daily clinical practice when it comes to assessment of large and small pulmonary artery disease. As computed tomography is more easy to use and widely available, it remains the diagnostic modality of choice. However, magnetic resonance imaging is the modality of choice when a comprehensive angiographic and functional assessment is deemed necessary.
Magnetic resonance angiography
Modality (human–computer interaction)
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Following blunt or penetrating trauma to the head and neck, a variety of traumatic vascular injuries may occur. Often the clinical presentation of a craniocervical arterial injury is delayed and neuroimaging studies are necessary to evaluate for delayed findings of intracranial infarction or hemorrhage. In this setting, magnetic resonance imaging (MRI) and magnetic resonance angiography (MRA) may allow a prompt noninvasive diagnosis of craniocervical vascular injury. MRA may be helpful in selecting those patients requiring conventional angiography and allows a noninvasive follow-up evaluation of arterial injury following institution of therapy.
Magnetic resonance angiography
Penetrating Trauma
Head trauma
Blunt trauma
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Objective To explore ultrasound(CDFI),magnetic resonance imaging(MRI) and CT angiography(CTA) clinical index in the diagnosis of carotid atherosclerosis.Methods Retrospective analysis of 185 cases of carotid atherosclerosis in patients of our hospital in 2010 January-2013 year in June,divided into CDFI groups according to diagnosis(n = 62),MRI group(n = 60) and CTA group(n = 63),contrast group diagnosis effect.Results In MRI group,diagnostic sensitivity and specificity were high,respectively 98.2% and 97.6%,group CDFI diagnostic sensitivity was 95.4%,specificity was 94.2%,CTA group were 90.8% and 92.1%,group MRI diagnostic sensitivity,specificity,accuracy were significantly higher than the other two groups;most of the fibrous cap in T1W1,PDW1 low resolution,while T2W1,3D-TOF and enhanced scanning resolution was higher,respectively 78.3%,60.0% and 86.7%,relatively easy to distinguish.Conclusion Ultrasound,magnetic resonance imaging and CT angiography in the diagnosis of carotid atherosclerosis has good effect,and each have advantages,the proposed joint diagnosed in conditions permitting downward three inspection way,while the equipment is insufficient,can only take the MRI enhancement scanning,also can effectively indicate the state of patients with fibrous cap,provide guidance for diagnosis of carotid atherosclerosis.
Magnetic resonance angiography
Clinical Diagnosis
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Contraindication
Hilum (anatomy)
Iodinated contrast
Magnetic resonance angiography
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A retrospective study of five patients with the clinical or magnetic resonance-based diagnosis of carotid dissection was done. Clinical data, imaging studies, treatment, and outcome were reviewed. The potential applicability of three-dimensional time-of-flight magnetic resonance angiography in these settings was evaluated.This modality reliably showed vascular abnormalities and focal, segmental, or aneurysmal dilatation when correlated with conventional angiograms in three patients. Turbulence and magnetic susceptibility at the acute turn of the carotid in the petrous canal led to a false-positive diagnosis on magnetic resonance angiography in one patient (in whom subtle fibromuscular hyperplasia was found with conventional angiography but missed with magnetic resonance angiography).When combined with appropriate clinical signs, magnetic resonance imaging and magnetic resonance angiography can reliably establish the diagnosis of carotid dissection. Pitfalls of magnetic resonance angiography are discussed.
Magnetic resonance angiography
Conventional angiography
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No AccessJournal of Urology1 Sep 1986Magnetic Resonance Imaging of the Renal Mass Nolan Karstaedt, David L. McCullough, Neil T. Wolfman, and Raymond B. Dyer Nolan KarstaedtNolan Karstaedt More articles by this author , David L. McCulloughDavid L. McCullough More articles by this author , Neil T. WolfmanNeil T. Wolfman More articles by this author , and Raymond B. DyerRaymond B. Dyer More articles by this author View All Author Informationhttps://doi.org/10.1016/S0022-5347(17)44975-5AboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookLinked InTwitterEmail To compare the effectiveness of magnetic resonance imaging with that of excretory urography, retrograde pyelography, ultrasound, computerized tomography, angiography and venography 34 patients with renal masses, including 25 renal cell carcinomas, were examined on a 0.15 Tesla Picker 1100 magnetic resonance imager with multiple pulse sequences. Pathological proof was available for all cases except renal cysts, for which ultrasound or computerized tomographic findings were accepted. Differentiation of solid from cystic lesions was seen with magnetic resonance imaging, ultrasound and computerized tomography but not excretory urography. Tumor invasion of the renal vein and inferior vena cava was visualized in 7 patients by magnetic resonance imaging, ultrasound, computerized tomography and venography but not by excretory urography. Magnetic resonance T1 contrast scans best characterized renal masses, with good resolution of metastatic lymphadenopathy and renal cysts. Scans showing T2 contrast were best for identification of pseudocapsules in renal carcinoma, venous invasion by tumors and papillary adenocarcinoma. Advantages of magnetic resonance imaging include differentiation of solid masses from benign cystic lesions, and identification of major blood vessels and vascular invasion without administration of contrast medium. Disadvantages of magnetic resonance imaging are long imaging times and motion artifacts. Advances by the manufacturer in solving these problems will strengthen the role of magnetic resonance imaging in renal evaluation. © 1986 by The American Urological Association Education and Research, Inc.FiguresReferencesRelatedDetailsCited byGohji K, Yamashita C, Ueno K, Shimogaki H and Kamidono S (2018) Preoperative Computerized Tomography Detection of Extensive Invasion of the Inferior Vena Cava by Renal Cell Carcinoma: Possible Indication for Resection with Partial Cardiopulmonary Bypass and Patch GraftingJournal of Urology, VOL. 152, NO. 6 Part 1, (1993-1996), Online publication date: 1-Dec-1994.Long J, Choyke P, Shawker T, Robertson C, Pass H, Walther M and Linehan W (2018) Intraoperative Ultrasound in the Evaluation of Tumor Involvement of the Inferior Vena CavaJournal of Urology, VOL. 150, NO. 1, (13-17), Online publication date: 1-Jul-1993.Treiger B, Humphrey L, Peterson C, Oesterling J, Mostwin J, Reitz B and Marshall F (2018) Transesophageal Echocardiography in Renal Cell Carcinoma: An Accurate Diagnostic Technique for Intracaval Neoplastic ExtensionJournal of Urology, VOL. 145, NO. 6, (1138-1140), Online publication date: 1-Jun-1991.Goldfarb D, Novick A, Lorig R, Bretan P, Montie J, Pontes J, Streem S and Siegel S (2018) Magnetic Resonance Imaging for Assessment of Vena Caval Tumor Thrombi: A Comparative Study with Venacavography and Computerized Tomography ScanningJournal of Urology, VOL. 144, NO. 5, (1100-1103), Online publication date: 1-Nov-1990.deKernion J (2018) Editorial CommentJournal of Urology, VOL. 142, NO. 4, (947-948), Online publication date: 1-Oct-1989.Horan J, Robertson C, Choyke P, Frank J, Miller D, Pass H and Linehan W (2018) The Detection of Renal Carcinoma Extension into the Renal Vein and Inferior Vena Cava: A Prospective Comparison of Venacavography and Magnetic Resonance ImagingJournal of Urology, VOL. 142, NO. 4, (943-947), Online publication date: 1-Oct-1989.Pritchett T, Raval J, Benson R, Lieskovsky G, Colletti P, Boswell W and Skinner D (2018) Preoperative Magnetic Resonance Imaging of Vena Caval Tumor Thrombi: Experience with 5 CasesJournal of Urology, VOL. 138, NO. 5, (1220-1222), Online publication date: 1-Nov-1987. Volume 136Issue 3September 1986Page: 566-570 Advertisement Copyright & Permissions© 1986 by The American Urological Association Education and Research, Inc.MetricsAuthor Information Nolan Karstaedt More articles by this author David L. McCullough More articles by this author Neil T. Wolfman More articles by this author Raymond B. Dyer More articles by this author Expand All Advertisement PDF downloadLoading ...
Pyelogram
Magnetic resonance angiography
Renal vein
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Motion blur is common in images captured by handheld devices, arising from hand, device and/or object motion. To restore sharp images from the images degraded by the motion, it is extremely important to assess the quality of the captured image and its corresponding blur profile as accurately as possible. In image deblurring, the perceived image quality is usually assessed by the SSIM and the PSNR metric. These methods have certain limitations and the objective image quality assessed by these methods can be contradictory to the subjectively perceived image quality. We propose a new reference image based objective blur level (BL) metric by utilizing point spread function/blur kernel analysis in this paper. In our experiments, we found our BL metric describes the perceived image quality of motion blurred images better than SSIM and PSNR in most cases. Additionally, our method performs well in low light and low texture images, where SSIM and PSNR metrics are prone to failure in describing blurriness/sharpness of the image.
Deblurring
Motion blur
Kernel (algebra)
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Magnetic resonance angiography
Claudication
Conventional angiography
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Most important measures in image research is the analysis of image quality. Quality analysis of images plays very important role in generation of multi viewed images and for the automatic image development in near future. Image quality measure can be performed by two ways subjective and objective. There are various subjective & objectives quality analysis technics are emerged in past year but these are applicable on single camera images. In multi camera images very less research is carried out for the quality analysis. Multi image is nothing but combining multiple images or events into single image. In multi camera images the quality is depend on various factors like configuration, calibration, features of different cameras used to take the images. In multi camera images we can find two types of distortions like photometric and geometric. This paper deals with the various methods and their results to achieve the quality of multi camera images. Here main focus is on the methods like PSNR, MSSIM & VIF and the results of these methods is compared with MIVQM Multi camera image Vision with quality measure (MIVQM) is calculated by combining indices like spatial motion, luminance and contrast and edge based arrangement. The result and comparison with the other measures, like Peak Signal-to Noise Ratio (PSNR), Mean Structural Similarity (SSIM), and Visual Information Fidelity (VIF) prove that MIVQM surpass other measure to capture the quality of images from multi camera system.
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Diagnostic imaging in cerebral venous sinus thrombosis poses difficulties due to the relatively rare incidence of this pathology and its usually inconclusive clinical and radiological symptoms. The preliminary examination is usually performed using computed tomography, whereas magnetic resonance imaging (MRI) provides better visualisation of the lesion. Computed tomography and magnetic resonance imaging angiography enable the characterisation of the blood flow in the pathologically affected vessels in more detail. Familiarity with the anatomic variations of the venous system and with the advantages and limitations of computed tomography/magnetic resonance imaging enables faster diagnosis of the pathology. This is significant for treatment, which, in many cases, can be efficient only if introduced at a sufficiently early stage.
Magnetic resonance angiography
Sinus (botany)
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