AJR. American journal of roentgenology
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AJR Am J Roentgenol · Jan 2010
Quantification of muscle choline concentrations by proton MR spectroscopy at 3 T: technical feasibility.
The quantification of choline in musculoskeletal tissues has several potential uses, including characterizing malignancy, but has not been previously achievable. We present a method of measuring the absolute concentration of choline by proton MR spectroscopy (MRS) in skeletal muscle at 3 T. ⋯ In the musculoskeletal system, the measurement of choline concentration by proton MRS at 3 T is feasible using water as an internal reference. These data provide a quantitative basis for future investigations of metabolite concentrations in normal and diseased musculoskeletal tissues.
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AJR Am J Roentgenol · Dec 2009
Comparative StudyMRI in the detection of prostate cancer: combined apparent diffusion coefficient, metabolite ratio, and vascular parameters.
The purpose of this study was to compare apparent diffusion coefficients, metabolic ratios, and vascularity values within histologically defined prostate tumors with those in nontumor tissue to determine which functional parameter or combination of parameters is best for differentiating tumor from nontumor tissue. ⋯ The combination of two functional parameters is associated with significant improvement in prostate cancer detection over use of any parameter alone. Use of a third parameter does not increase the rate of detection.
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AJR Am J Roentgenol · Dec 2009
Comparative StudyComparison of ultrasound and CT in the evaluation of pneumonia complicated by parapneumonic effusion in children.
The purpose of our study was to compare chest ultrasound and chest CT in children with complicated pneumonia and parapneumonic effusion. ⋯ In our series, chest ultrasound and chest CT were similar in their ability to detect loculated effusion and lung necrosis or abscess resulting from complicated pneumonia. Chest CT did not provide any additional clinically useful information that was not also seen on chest ultrasound. We suggest that the imaging workup of complicated pediatric pneumonia include chest radiography and chest ultrasound, reserving chest CT for cases in which the chest ultrasound is technically limited or discrepant with the clinical findings.
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AJR Am J Roentgenol · Dec 2009
Respiratory gating enhances imaging of pulmonary nodules and measurement of tracer uptake in FDG PET/CT.
The aim of this study was to evaluate prospectively the effects of respiratory gating during FDG PET/CT on the determination of lesion size and the measurement of tracer uptake in patients with pulmonary nodules in a clinical setting. ⋯ Our findings suggest that the use of PET respiratory gating in PET/CT results in lesion volumes closer to those assessed by CT and improved measurements of tracer uptake for lesions in the lungs.