AJR. American journal of roentgenology
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AJR Am J Roentgenol · Mar 2002
Comparative StudyComparison of permeability in high-grade and low-grade brain tumors using dynamic susceptibility contrast MR imaging.
The purpose of this study was to compare permeability measurements in high-grade and low-grade glial neoplasms using a T2(*)-weighted method. Our hypothesis was that permeability measurements using a T2(*)-weighted technique would show permeability in high-grade neoplasms to be higher than that in low-grade neoplasms. ⋯ Permeability values for high-grade tumors obtained using a T2(*)-weighted method were significantly greater than those for low-grade tumors and are consistent with previous studies reporting results using T1-weighted methods.
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AJR Am J Roentgenol · Mar 2002
High-resolution breath-hold contrast-enhanced MR angiography of the entire carotid circulation.
The purpose of this study was to evaluate the effect of breathing on image quality of the aortic arch and carotid vessels during contrast-enhanced MR angiography and to show that high-resolution breath-hold contrast-enhanced MR angiography combined with a timing-bolus technique can produce high-quality images of the entire carotid circulation. ⋯ Breath-holding greatly improves the sharpness of the aortic arch and great vessel origins but has no effect on visualization of the carotid vessels. High-resolution breath-hold contrast-enhanced MR angiography can produce high-quality, artifact-free images of the entire carotid circulation from the aortic arch to the intracerebral circulation.
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AJR Am J Roentgenol · Mar 2002
Cervical spine injuries in patients 65 years old and older: epidemiologic analysis regarding the effects of age and injury mechanism on distribution, type, and stability of injuries.
Our objective was to describe types and distribution of cervical spine injuries in elderly patients in regard to causative trauma mechanism and patient age. ⋯ Cervical spine injuries in elderly patients tend to involve more than one level with consistent clinical instability and commonly occur at the atlantoaxial complex. Old elderly patients and patients who fall from standing height are more prone to injuries of the upper cervical spine.
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AJR Am J Roentgenol · Mar 2002
Comparative StudyPrediction of postoperative lung function in patients with lung cancer: comparison of quantitative CT with perfusion scintigraphy.
Prediction of postoperative lung function is important in preoperative evaluation of patients with lung cancer. Perfusion scintigraphy is the current method to assess the fractional contribution of lung function of the remaining lung. We developed a quantitative CT method and compared it with perfusion scintigraphy for predictions of postoperative forced expiratory volume in 1 sec (FEV1) in patients with lung cancer. ⋯ Given its simplicity, we proposed that quantitative CT be widely used in predicting postoperative FEV1.
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AJR Am J Roentgenol · Mar 2002
Development of a perigraft seroma around modified Blalock-Taussig shunts: imaging evaluation.
The modified Blalock-Taussig shunt is a synthetic shunt between the subclavian and pulmonary artery, frequently used in the treatment of children with pulmonary hypoperfusion caused by congenital heart disease. The development of a perigraft seroma is a known complication of this procedure. We sought to describe the imaging features of a perigraft seroma and to define an optimal diagnostic strategy in patients with a suspected perigraft seroma. ⋯ As was found in these critically ill children, sonography has an advantage over CT and MR imaging because of its portability and, therefore, capability for bedside use. We recommend the use of sonography as the initial imaging modality in suspected cases of perigraft seroma development.