Article Figures & Data
Figures
- FIGURE 1.
(A) Carbon headrest covering temporal to occipital regions of head, with CT value of 300 HU. (B) Hybrid headrest constructed from XPS and stainless steel, covering occipital region of head (which is in contact with XPS), with CT value of −980 HU.
- FIGURE 2.
3D stereotactic region-of-interest template for A+B/G ratio (A) and D+F/G ratio (B).
- FIGURE 3.
Comparison of 99mTc-ECD SPECT images obtained using carbon and XPS headrests in healthy controls. Images constructed with FBP Chang AC and OSEM Chang AC using carbon headrest show higher cerebral blood flow in anterior part of brain than do images constructed with same methods using XPS headrest. In images constructed with OSEM CTAC, anterior and posterior parts of brain do not differ between images obtained using carbon and XPS headrests. SRT = stereotaxic region-of-interest template; ROI = region of interest.
- FIGURE 4.
Comparison of 99mTc-ECD SPECT images obtained using carbon and XPS headrests in patients with cerebrovascular disease. Fluid-attenuated inversion-recovery MR images show high-intensity lesions due to cerebral infarction in left frontal and temporal lobes, including insular cortex. 3D CT angiography shows severe stenosis of left middle cerebral artery. For anterior brain region, images constructed using FBP Chang AC and OSEM Chang AC with carbon headrest show higher cerebral blood flow than do images constructed using same methods with XPS headrest. Images constructed using OSEM CTAC with carbon headrest show no difference from images constructed using same methods with XPS headrest. CTA = CT angiography; FLAIR = fluid-attenuated inversion-recovery; ROI = region of interest; SRT = stereotaxic region-of-interest template.
Tables
- TABLE 1.
Comparison of A+B/G and D+F/G Ratios Between Carbon and XPS Headrests in Healthy Controls (n = 10)
A+B/G D+F/G Parameter Carbon XPS P Carbon XPS P FBP Chang AC 0.97 ± 0.02 0.93 ± 0.02 <0.001* 0.89 ± 0.02 0.89 ± 0.02 0.173 OSEM Chang AC 0.98 ± 0.04 0.94 ± 0.02 <0.001* 0.90 ± 0.02 0.90 ± 0.02 0.423 OSEM CTAC 0.91 ± 0.02 0.91 ± 0.02 0.322 0.88 ± 0.01 0.88 ± 0.01 0.037 ↵* Statistically significant.
- TABLE 2.
Comparison of A+B/G and D+F/G Ratios Between Carbon and XPS Headrests in Patients with Cerebrovascular Disease (n = 43)
A+B/G D+F/G Parameter Carbon XPS P Carbon XPS P FBP Chang AC 0.96 ± 0.05 0.91 ± 0.05 <0.001* 0.87 ± 0.04 0.87 ± 0.04 0.343 OSEM Chang AC 0.96 ± 0.05 0.92 ± 0.06 <0.001* 0.88 ± 0.04 0.88 ± 0.04 0.938 OSEM CTAC 0.89 ± 0.04 0.89 ± 0.05 0.893 0.86 ± 0.03 0.86 ± 0.03 0.099 ↵* Statistically significant.
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