Subarachnoid clot can be removed directly during surgical clipping, which is not possible with endovascular treatment. However, the percentage reduction of the clot on days 3 through 5 did not differ between the 2 groups.
The purpose of our study is to investigate the feasibility of automated patient verification using multi-planar reconstruction (MPR) images generated from three-dimensional magnetic resonance (MR) imaging of the brain. Several anatomy-related MPR images generated from three-dimensional fast scout scan of each MR examination were used as biological fingerprint images in this study. The database of this study consisted of 730 temporal pairs of MR examination of the brain. We calculated the correlation value between current and prior biological fingerprint images of the same patient and also all combinations of two images for different patients to evaluate the effectiveness of our method for patient verification. The best performance of our system were as follows: a half-total error rate of 1.59 % with a false acceptance rate of 0.023 % and a false rejection rate of 3.15 %, an equal error rate of 1.37 %, and a rank-one identification rate of 98.6 %. Our method makes it possible to verify the identity of the patient using only some existing medical images without the addition of incidental equipment. Also, our method will contribute to patient misidentification error management caused by human errors.
Background and Purpose—
Symptomatic vasospasm is an important factor that affects the outcomes of aneurysmal subarachnoid hemorrhage. Subarachnoid blood volume can predict symptomatic vasospasm, and we postulated that the blood clot density would also be an important factor involved in such events. The present study aimed to determine the relationship between the incidence of symptomatic vasospasm and the Hounsfield unit (HU) value of the interpeduncular cistern that reflects the density of hematomas.
Methods—
Data from 323 patients admitted and treated at a single center between 2008 and 2017 within 24 hours of subarachnoid hemorrhage onset were retrospectively analyzed. Initial HU values of the interpeduncular cistern were measured using CT, then correlations with the incidence of symptomatic vasospasm and HU values as well as other variables were assessed.
Results—
Symptomatic vasospasm developed in 54 (16.7%) of the 323 patients. The incidence of symptomatic vasospasm was low (1.8%, 2/166) for HU <50, but this incidence increased greatly when the HU value exceeded 50 (23.7%, 22/93 for HU >50 to ≤60, and 45.3%, 29/64 for HU >60). The odds ratio for symptomatic vasospasm was 2.0 (95% CI, 1.6–2.4) per 5 HU increase. Symptomatic vasospasm correlated significantly with intraventricular hemorrhage (
P
=0.05) and with intracerebral hematoma (
P
=0.046) but even more significantly with the HU value of the interpeduncular cistern (
P
<0.0001).
Conclusions—
The HU value of the interpeduncular cistern on initial CT is an accurate and reliable predictor of symptomatic vasospasm.
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