The optimal velocity encoding of phase-contrast magnetic resonance angiography （PC MRA） in measuring cerebral blood flow volume （BFV） ranges from 60 to 80 cm/s. To verify the accuracy of two-dimensional （2D） PC ...The optimal velocity encoding of phase-contrast magnetic resonance angiography （PC MRA） in measuring cerebral blood flow volume （BFV） ranges from 60 to 80 cm/s. To verify the accuracy of two-dimensional （2D） PC MRA, the present study localized the region of interest at blood vessels of the neck using PC MRA based on three-dimensional time-of-flight sequences, and the velocity encoding was set to 80 cm/s. Results of the measurements showed that the error rate was 7.0±6.0% in the estimation of BFV in the internal carotid artery, the external carotid artery and the ipsilateral common carotid artery. There was no significant difference, and a significant correlation in BFV between internal carotid artery ＋ external carotid artery and ipsilateral common carotid artery. In addition, the BFV of the common carotid artery was correlated with that of the ipsilateral internal carotid artery. The main error was attributed to the external carotid artery and its branches. Therefore, after selecting the appropriate scanning parameters and protocols, 2D PC MRA is more accurate in the determination of BFV in the carotid arteries.展开更多
Purpose:To explore the diagnosis and treatment of traumatic external carotid branch pseudoaneurysms.Methods:Eleven cases of traumatic external carotid artery branch pseudoaneurysms were admitted in our hospital.Digita...Purpose:To explore the diagnosis and treatment of traumatic external carotid branch pseudoaneurysms.Methods:Eleven cases of traumatic external carotid artery branch pseudoaneurysms were admitted in our hospital.Digital subtraction angiography was performed in all patients.It revealed that the pseudoaneurysms originated from the internal maxillary artery in 5 cases,superficial temporal artery in 5 cases and occipital artery in 1 case.Five cases of internal maxillary artery pseudoaneurysms and 2 cases of superficial temporal artery pseudoaneurysms were treated by embolization;the other 3 cases were surgically resected.Results:Complete cessation of nasal bleeding was achieved in all the 5 pseudoaneurysms of internal maxillary artery after the endovascular therapies.Scalp bleeding stopped and scalp defect healed up in 2 patients with superficial temporal artery pseudoaneurysms treated by interventional therapy.All patients were followed up for 0.5-2.0 years without recurrence of nosebleed and scalp lump.Conclusion:For patients with repeated severe epistaxis after craniocerebral injury,digital subtraction angiography should be performed as soon as possible to confirm traumatic pseudoaneurysm.Endovascular therapy is an effective method for traumatic internal maxillary artery pseudoaneurysms.For patients with scalp injuries and pulsatile lumps,further examinations including digital subtraction angiography should be performed to confirm the diagnosis.Surgical treatment or endovascular therapy for scalp traumatic pseudoaneurysm is effective.展开更多
基金the Medical Program of Scientific & Technical Foundation in Xiamen in 2008, No. 3502Z20084028
文摘The optimal velocity encoding of phase-contrast magnetic resonance angiography （PC MRA） in measuring cerebral blood flow volume （BFV） ranges from 60 to 80 cm/s. To verify the accuracy of two-dimensional （2D） PC MRA, the present study localized the region of interest at blood vessels of the neck using PC MRA based on three-dimensional time-of-flight sequences, and the velocity encoding was set to 80 cm/s. Results of the measurements showed that the error rate was 7.0±6.0% in the estimation of BFV in the internal carotid artery, the external carotid artery and the ipsilateral common carotid artery. There was no significant difference, and a significant correlation in BFV between internal carotid artery ＋ external carotid artery and ipsilateral common carotid artery. In addition, the BFV of the common carotid artery was correlated with that of the ipsilateral internal carotid artery. The main error was attributed to the external carotid artery and its branches. Therefore, after selecting the appropriate scanning parameters and protocols, 2D PC MRA is more accurate in the determination of BFV in the carotid arteries.
基金supported by Zhejiang Provincial Medical Science and Technology Program(2018YK802)。
文摘Purpose:To explore the diagnosis and treatment of traumatic external carotid branch pseudoaneurysms.Methods:Eleven cases of traumatic external carotid artery branch pseudoaneurysms were admitted in our hospital.Digital subtraction angiography was performed in all patients.It revealed that the pseudoaneurysms originated from the internal maxillary artery in 5 cases,superficial temporal artery in 5 cases and occipital artery in 1 case.Five cases of internal maxillary artery pseudoaneurysms and 2 cases of superficial temporal artery pseudoaneurysms were treated by embolization;the other 3 cases were surgically resected.Results:Complete cessation of nasal bleeding was achieved in all the 5 pseudoaneurysms of internal maxillary artery after the endovascular therapies.Scalp bleeding stopped and scalp defect healed up in 2 patients with superficial temporal artery pseudoaneurysms treated by interventional therapy.All patients were followed up for 0.5-2.0 years without recurrence of nosebleed and scalp lump.Conclusion:For patients with repeated severe epistaxis after craniocerebral injury,digital subtraction angiography should be performed as soon as possible to confirm traumatic pseudoaneurysm.Endovascular therapy is an effective method for traumatic internal maxillary artery pseudoaneurysms.For patients with scalp injuries and pulsatile lumps,further examinations including digital subtraction angiography should be performed to confirm the diagnosis.Surgical treatment or endovascular therapy for scalp traumatic pseudoaneurysm is effective.
