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Volume 9 (1996)
- Issue 4 Pages 105-
- Issue 3 Pages 68-
- Issue 2 Pages 33-
- Issue 1 Pages 3-
Volume 9, Issue 4
Displaying 1-6 of 6 articles from this issue
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Hidemasa NAGAI, Kouzo MORITAKE, Mikio TAKAYA, Atsushi FUKUMA1996 Volume 9 Issue 4 Pages 105-109
Published: 1996
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSEvaluation of intracranial hemodynamics by transcranial Doppler ultrasonography (TCD) has the problem of variation in skull thickness. Using an adult dog, we studied the effect of skull thickness on the cerebral blood flow measured with TCD through the exposed temporal bone of three different thicknesses. While mean flow velocity (MFV) and pulsatility index (PI) values were not influenced by skull thickness at a fixed sampling depth, the S/N ratio was greatly influenced by MFV and PI, while the sampling depth had a small effect on MFV and a large effect on PI. These results should be considered when assessing intracranial hemodynamics by TCD.View full abstractDownload PDF (624K) -
—Validity of vein patch angioplasty—Masahito AGAWA, Toshio TSUDA, Hiromi UETA, Kensaku TAKASE, Shin UEDA1996 Volume 9 Issue 4 Pages 110-113
Published: 1996
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSHigh-resolution B-mode ultrasonography was used for postoperative evaluation of 72 carotid arteries in 65 patients after carotid endarterectomy (CEA) . The intima-media complex (IMC) and the dilative parameter (d-CEA/d-CCA) were measured. The IMC of the VP-A group (operated on with a vein patch, within 4 years of follow-up, N=30) (mean±SD: 0.85±0.51 mm) was relatively thinner than that of the NON-VP-A group (operated on without a vein patch, within 4 years of follow-up, N=25) (1.13±0.73 mm) . The d-CEA/d-CCA of the VP-A group (1.65±0.42) was significantly higher than that of the NON-VP-A group (1.24±0.24) . In conclusion, CEA with a vein patch led to smooth dilatation of the treated carotid artery and seemed to be effective for reducing restenotic changes in endarterectomized arteries.View full abstractDownload PDF (2917K) -
Yasushi KUROKAWA, Seisho ABIKO, Tomomi OKAMURA, Norio IKEDA, Kohsaku W ...1996 Volume 9 Issue 4 Pages 114-118
Published: 1996
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSIn three patients with vertebral artery dissection presenting subarachnoid hemorrhage, hemodynamic changes in the affected arteries were investigated by transcranial Doppler sonography (TCD) . On measurement of the vertebrobasilar system by TCD, a combined midline and lateral approach was used for accurate evaluation of the hemodynamic state of the system.
Two-layered Doppler waveform was recorded in two patients, and decrease of the flow velocity in the affected artery compared with the contralateral vertebral artery was recorded in the other patient. This two-layered waveform may be a direct finding of arterial dissection.View full abstractDownload PDF (7002K) -
Takeshi SAMPEI, Hiromu HADEISHI, Shingo KAWAMURA, Yutaka NONOYAMA, Aki ...1996 Volume 9 Issue 4 Pages 119-123
Published: 1996
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSTranscranial Doppler ultrasonography (TCD) is a useful tool for detecting cerebral vasospasm following subarachnoid hemorrhage. However, some problems are associated with this procedure, such as misdiagnosis due to a mismatch between flow velocity and vascular diameter. Therefore, the present study investigated the discrepancy between the angiographic findings and flow velocity measured by TCD in the detection of cerebral vasospasm.
False positive cases showing increased velocity without angiographic vasospasm in 12.1% of the present subjects. Similarly, false negative cases that showed no increase in velocity despite angiographic findings suggestive of vasospasm accounted for 21.2% of the present subjects. False positive cases were most frequent in younger subjects, whereas false negative cases were seen more frequently in older subjects. Accurate examination of elderly patients can sometimes present difficulties due to thickening of the cranial window or elongation of the arteries. Therefore, in addition to the absolute flow velocity, the clinical changes, angiographic findings and cerebral blood flow must also be considered.View full abstractDownload PDF (4687K) -
—Ultrasound computed tomograpy (US-CT) for neurosurgical procedures—Hiroshi Iseki, Nobuhiko Hata, Takeshi Kurihara, Takeyoshi Dohi, Kiyota ...1996 Volume 9 Issue 4 Pages 124-128
Published: 1996
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSMinimally invasive surgery is useful for hastening recovery, shortens the operation itself and eliminates unnecessary procedures, thus reducing blood loss and complications. Recent medical imaging technology has made it possible to view the human body in three dimensions. According to changeable conditions, sector ultrasonography, rotating ultrasonography and ultrasound CT (US-CT) offer surgeons information useful for navigation in an operating theater. Combined use of a US-CT probe and an ultrasound locational sensing system provide beneficial information for image-guided biopsy or deep brain surgery, since it has the potential to identify the anatomical localization of a tumor or other lesions at any time during surgical manipulation. Our newly developed US-CT navigator system is a useful tool for neuro-navigation.View full abstractDownload PDF (7865K) -
1996 Volume 9 Issue 4 Pages 132-147
Published: 1996
Released on J-STAGE: October 14, 2010
JOURNAL FREE ACCESSDownload PDF (2873K)
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