Medical Physics Essay

4302 WordsApr 11, 201118 Pages
Evaluation of Diagnostic Techniques: MAGNETIC RESONANCE IMAGING AND COMPUTERISED TOMOGRAPHY SCANNING OF THE BRAIN (Photo http://www.radiologyinfo.org/en/photocat/gallery3.cfm?pid=1&image=philips6.jpg&pg=headmr) Contents Abstract 3 MRI - Introduction 4 Spin Echo Sequencing 5 Larmor Equation 5 The Image 5 Advantages of Magnetic Resonance Imaging 5 Limitations of Magnetic Resonance Imaging 6 CT scanning - Introduction 6 The Image 7 Advantages of CT scanning 7 Limitations of CT scanning 7 Conclusions and Evaluations 7 Discussions 8 Bibliography 8 References 9 Abstract This article examines the effectiveness of Magnetic Resonance Imaging and Computed Tomography scanning in the diagnosis of traumatic brain injury. The brain injuries include either extracerebral (outside the brain) or intracerebral lesions (inside the brain). The former require rapid diagnosis and therapy and the latter determine management in an intensive therapy, unit and outcome. Standard X-rays are obsolete. The CT, rapidly performed, is the most relevant imaging procedure for surgical lesions. However, cortical contusions and diffuse axonal injuries are underestimated by CT and best depicted by MRI. Only late MRI has a strong correlation with neuropsychological outcome. In terms of prognosis, MRI needs to be evaluated. The indications include: a) Unstable neurological status: CT; b) Moderate head injury: CT may help to decide hospital admission; c) Severe head injury: initial CT may be followed by MRI; d) Long-term consequences: MRI. Special Indications: a) angio-MRI: suspicion of vascular lesion; b) CT with thin slices and bone window: depressed skull fracture; c) Teleradiology (image transfer): to decide a patient transport from a

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