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Comparison MRV techniques - Essay Example

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Comparison of MRV techniques Introduction Venous sinus thrombosis disease is the presence of a blood clot in the dural venous sinuses that drains blood from the brain. Doctors use different methods in diagnosing this condition. Different techniques yield similar results, yet they are said to contrast in a number of ways…
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Download file to see previous pages This literature review is a comparison of these techniques. As such, the concern of the paper will be a focus on the effectiveness of each technique in diagnosing this condition and the reliability of the results. While some of the previous studies did compare either two or all three techniques, this research focuses on the three techniques. Using technical programs and methods, I will rely the verdict of the three techniques in the following literature review. In providing clinical neuroradiologists who perform clinical magnetic resonance venography (MRV) of the brain with the most reliable method of imaging the brain, Campeau, N. & Patton, A. (2013, p. 3671) compares the effect of 3D-TOF, 2D-TOF and gadolinium enhanced MRV techniques, all applied in 23 patients. Accuracy of the resultant PC-MRV images in detecting vascular stenosis as well as the quality and artifacts of the images obtained was used as the determinant for the most reliable technique. According to the results, 3D PC MRV acquisition was robust and successfully obtained in all patients. However, two attempts of Bolus gadolinium MRV yielded no results in a newborn, yet 3D PC MRV provided results in the same patient. For patients who register negative results to gadolinium, 3D PC MRV is recommended. The superiority of this technique in comparison to all three methods is seen by the fact that the technique provides less saturation dropout and has an improved visualization of cortical veins. Choosing the appropriate volume orientation minimizes saturation effects. Compared to sagittal or coronal directions, artifacts are more marked in the brain with axial acquisition. Techniques in medicine are said to be reliable if they yield better results. From the study, results of 3D PC MRV technique were more reliable and more effective in diagnosing venous sinus thrombosis in the patients, making it the best technique among all other techniques available. Various clinical situations necessitate imaging of the complex intracranial venous system. These include intracranial venous thrombosis and the preoperative assessment of meningioma among other intracranial tumors which require clear depiction of the patency of adjacent dural neural venous sinuses (Jui-Hsun et al. 2010, p.31). There has been a wide use of the two-dimensional time-of-flight (2D TOF) magnetic resonance venography (MRV) as a means of visualizing the intracranial venous system. The major limitation of 2D TOF MRV is its intravascular signal loss resultant from either in-hale saturation of spins or tortuosity and turbulent flows that occurs from various points such as the posterior portion of the sagittal sinus, torcular herophili, transverse sinus, transverse-sigmoid junction, and sigmoid sinuses. In their study, Jui-Hsun et al. (2010) sought to provide a remedy to this. 3-dimensional gadolinium-enhanced elliptic centric-ordered (3D GEC) MRV was found as the most effective technique. This technique is flow-insensitive, and avoids common flow related artifacts seen on 2D TOF MRV. To prove this, the researchers sought to compare real-time three-dimensional gadolinium-enhanced elliptic centric-ordered Mr Venography and two-dimensional time-of-flight Mr Venography of the intracranial venous system. In their study, 53 patients were subjected to 2D and 3D MRV tests and their venous structures evaluated by 2 ...Download file to see next pagesRead More
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