AIM To demonstrate feasibility of vessel wall imaging of the superficial palmar arch using high frequency microultrasound, 7T and 3T magnetic resonance imaging(MRI).METHODS Four subjects(ages 22-50 years) were scanned...AIM To demonstrate feasibility of vessel wall imaging of the superficial palmar arch using high frequency microultrasound, 7T and 3T magnetic resonance imaging(MRI).METHODS Four subjects(ages 22-50 years) were scanned on a micro-ultrasound system with a 45-MHz transducer(Vevo 2100, Visual Sonics). Subjects' hands were then imaged on a 3T clinical MR scanner(Siemens Biograph MMR) using an 8-channel special purpose phased array carotid coil. Lastly, subjects' hands were imaged on a 7T clinical MR scanner(Siemens Magnetom 7T Whole Body Scanner) using a custom built 8-channel transmit receive carotid coil. All three imaging modalities were subjectively analyzed for image quality and visualization of the vessel wall. RESULTS Results of this very preliminary study indicated that vessel wall imaging of the superficial palmar arch was feasible with a whole body 7T and 3T MRI in comparison with micro-ultrasound. Subjective analysis of image quality(1-5 scale, 1: poorest, 5: best) from B mode, ultrasound, 3T SPACE MRI and 7T SPACE MRI indicated that the image quality obtained at 7T was superior to both 3T MRI and micro-ultrasound. The 3D SPACE sequence at both 7T and 3T MRI with isotropic voxels allowed for multi-planarreformatting of images and allowed for less operator dependent results as compared to high frequency microultrasound imaging. Although quantitative analysis revealed that there was no significant difference between the three methods, the 7T Tesla trended to have better visibility of the vessel and its wall. CONCLUSION Imaging of smaller arteries at the 7T is feasible for evaluating atherosclerosis burden and may be of clinical relevance in multiple diseases.展开更多
Traumatic injuries to the thumb resulting in segmental loss of a digital artery are not uncommon.To bridge the gap and repair a transacted digital artery,the superficial palmar arch or the radial digital artery of the...Traumatic injuries to the thumb resulting in segmental loss of a digital artery are not uncommon.To bridge the gap and repair a transacted digital artery,the superficial palmar arch or the radial digital artery of the index finger can be used to reconstruct the ulnar digital artery of thumb for revascularization.Revascularization following segmental loss resulting from a crushed ulnar digital artery of the thumb can be performed based on the superficial palmar arch or the radial digital artery of the index finger,avoiding anastomosis at two sites and hence providing better results.The digital vein from the index finger can also be used to enhance the venous return of the injured thumb.However,because of known variability in the palmar arch,intraoperative verification is needed to ensure the safe transfer of the arch or the radial digital artery of the index finger.The aim of this article is to discuss the possibilities for thumb revascularization,using a case report in which the injured thumb was revascularized with a superficial palmar arch.展开更多
文摘AIM To demonstrate feasibility of vessel wall imaging of the superficial palmar arch using high frequency microultrasound, 7T and 3T magnetic resonance imaging(MRI).METHODS Four subjects(ages 22-50 years) were scanned on a micro-ultrasound system with a 45-MHz transducer(Vevo 2100, Visual Sonics). Subjects' hands were then imaged on a 3T clinical MR scanner(Siemens Biograph MMR) using an 8-channel special purpose phased array carotid coil. Lastly, subjects' hands were imaged on a 7T clinical MR scanner(Siemens Magnetom 7T Whole Body Scanner) using a custom built 8-channel transmit receive carotid coil. All three imaging modalities were subjectively analyzed for image quality and visualization of the vessel wall. RESULTS Results of this very preliminary study indicated that vessel wall imaging of the superficial palmar arch was feasible with a whole body 7T and 3T MRI in comparison with micro-ultrasound. Subjective analysis of image quality(1-5 scale, 1: poorest, 5: best) from B mode, ultrasound, 3T SPACE MRI and 7T SPACE MRI indicated that the image quality obtained at 7T was superior to both 3T MRI and micro-ultrasound. The 3D SPACE sequence at both 7T and 3T MRI with isotropic voxels allowed for multi-planarreformatting of images and allowed for less operator dependent results as compared to high frequency microultrasound imaging. Although quantitative analysis revealed that there was no significant difference between the three methods, the 7T Tesla trended to have better visibility of the vessel and its wall. CONCLUSION Imaging of smaller arteries at the 7T is feasible for evaluating atherosclerosis burden and may be of clinical relevance in multiple diseases.
文摘Traumatic injuries to the thumb resulting in segmental loss of a digital artery are not uncommon.To bridge the gap and repair a transacted digital artery,the superficial palmar arch or the radial digital artery of the index finger can be used to reconstruct the ulnar digital artery of thumb for revascularization.Revascularization following segmental loss resulting from a crushed ulnar digital artery of the thumb can be performed based on the superficial palmar arch or the radial digital artery of the index finger,avoiding anastomosis at two sites and hence providing better results.The digital vein from the index finger can also be used to enhance the venous return of the injured thumb.However,because of known variability in the palmar arch,intraoperative verification is needed to ensure the safe transfer of the arch or the radial digital artery of the index finger.The aim of this article is to discuss the possibilities for thumb revascularization,using a case report in which the injured thumb was revascularized with a superficial palmar arch.
