Journal of neuroimaging : official journal of the American Society of Neuroimaging
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Case Reports
Alterations in surgical plan based on intraoperative portable head computed tomography imaging.
Intraoperative imaging offers potential for utility in many clinical scenarios. Portable computed tomography (CT) offers a versatile potential alternative when immediate imaging may alter the surgical plan and magnetic resonance imaging is not practical. ⋯ In select cases, intraoperative portable head CT leads to changes in the surgical plan in 32% of cases. This potentially prevents a return to the operating room and offers a cost-effective alternative to fixed intraoperative imaging facilities.
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Multicenter Study
Preliminary MRI quality assessment and device acceptance guidelines for a multicenter bioclinical study: the GO Glioblastoma Project.
It is a major challenge to guarantee homogeneous acquisition during a prospective multicenter magnetic resonance imaging (MRI) study that makes use of different devices. The goal of the multicenter Grand Ouest Glioblastoma Project (GOGP) was to correlate MRI quantitative parameters with biological markers extracted from image-guided biopsies. Therefore, it was essential to ensure spatial coherence of the parameters as well as the signal intensity and homogeneity. ⋯ A fourth test-object was used to assess T1 accuracy. Although geometry-related parameters, signal-to-noise ratio, uniformity, and T1 measurements varied slightly depending on the different devices, they nevertheless remained within the recommendations and expectations of the multicenter project. This kind of quality control procedure should be undertaken as a prerequisite to any multicenter clinical project involving quantitative MRI and comparison of data acquisitions with quantitative biological image-guided biopsies.
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Cervical spine symptoms are a major cause of visits to general or spinal orthopedic surgeons or even primary care physicians. Although in this era the imaging studies can precisely rule out or diagnose pathologies in the spine, all of these studies have limitations. Computerized tomography (CT) scan consists of radiation exposure to the patients and it should be done with caution. Magnetic resonance imaging (MRI) is a highly effective imaging tool, but in many countries it is still costly. The goal of our study was to determine whether a simple clinical test can help the clinician to identify the patients who need to be sent for these imaging studies. ⋯ This paper demonstrate that patients with positive Spurling test have probable nerve root pressure and should be sent for further imaging studies. In patients with negative Spurling test, the possibility of nerve root pressure is less likely.
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The human visual system responds asymmetrically to visual motion stimuli in opposite directions due to the involvement of the same brain areas but different operating processes. The expansion mode is thought to invoke a vigilance mechanism, whereas the contraction mode does not. ⋯ These findings show that detect spatiotemporal differences between expansion and contraction modes can be readily detected using time-flow charts. Moreover, delay interactions could be insensitive to object motion away from the observer.
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Perfusion-CT (PCT) of the brain is a rapidly evolving imaging technique used to assess blood supply to the brain parenchyma. PCT is readily available at most imaging centers, resulting in steadily increasing use of this imaging technique. ⋯ Therefore, it is important for the radiologist to recognize altered perfusion patterns observed in diseases other than typical ischemic stroke. The goal of this article is to show the perfusion maps and review the perfusion patterns observed in some subtypes of atypical stroke and in neurological entities other than stroke, so that they are recognized and not confused with the PCT patterns observed in patients with typical ischemic stroke.