نتایج جستجو برای: phantoms
تعداد نتایج: 12252 فیلتر نتایج به سال:
Figure 2. Comparision of activation maps with and without susceptibility artifacts from SPM2. (a) true activation map. (b) activation map detected from phantoms without susceptibility artifacts. (c) activation map detected from phantoms with susceptiblity artifacts. More false activations are obsevered in (c), and the detected activation regions are spatially shifted relative to the true map (a...
The Radiological Physics Center (RPC) developed two heterogeneous anthropomorphic quality assurance phantoms for use in verifying the accuracy of radiation delivery: one for intensity-modulated radiation therapy (IMRT) to the pelvis and the other for stereotactic body radiation therapy (SBRT) to the thorax. The purpose of this study was to describe the design and development of these two phanto...
As an extension of previous work on computer-generated phantoms, more accurate, realistic phantoms are generated by integrating image distortion and signal loss caused by susceptibility variations. With the addition of real motions and activations determined from actual functional MRI studies, these phantoms can be used by the fMRI community to assess with higher fidelity pre-processing algorit...
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