AJR. American journal of roentgenology
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AJR Am J Roentgenol · Sep 2014
Comparative StudyQuantitative evaluation of benign and malignant vertebral fractures with diffusion-weighted MRI: what is the optimum combination of b values for ADC-based lesion differentiation with the single-shot turbo spin-echo sequence?
The purpose of our study was to determine the optimum combination of b values for calculating the apparent diffusion coefficient (ADC) using a diffusion-weighted (DW) single-shot turbo spin-echo (TSE) sequence in the differentiation between acute benign and malignant vertebral body fractures. ⋯ ADCs calculated with a combination of low to intermediate b values (b = 100, 250, and 400 s/mm(2)) provide the best diagnostic performance of a DW single-shot TSE sequence to differentiate acute benign and malignant vertebral body fractures.
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AJR Am J Roentgenol · Sep 2014
Breast cancer detection using double reading of unenhanced MRI including T1-weighted, T2-weighted STIR, and diffusion-weighted imaging: a proof of concept study.
The purpose of this study was to investigate the diagnostic performance of unenhanced MRI in detecting breast cancer and to assess the impact of double reading. ⋯ An unenhanced breast MRI protocol composed of T1-weighted gradient echo, T2-weighted STIR, and echo-planar DWI enabled breast cancer detection with sensitivity of 76-78% and specificity of 90% without a gain in sensitivity from double reading.
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The article reviews a select group of traumatic upper extremity injuries that can be easily misinterpreted on radiographs. ⋯ The awareness of these specific injuries and an understanding of their underlying pathophysiology and the role that radiographs can play in their evaluation will give the reader the best opportunity to make the important imaging findings and guide appropriate treatment.
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Radiography remains the imaging standard for fracture detection after trauma. However, fractures continue to be the most common type of missed injuries. In this article, we describe common radiographic pitfalls in lower extremity trauma and describe strategies for dealing with them. ⋯ Pitfalls include insufficient views, improperly positioned or technically imperfect radiographs, nondisplaced fractures, commonly missed locations, small avulsions portending large injury, sesamoid injuries, satisfaction of search, incomplete or faulty reasoning, and periprosthetic fractures.
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AJR Am J Roentgenol · Sep 2014
Comparative StudyComparison of the artifacts caused by metallic implants in breast MRI using dual-echo dixon versus conventional fat-suppression techniques.
The purpose of this article is to evaluate and compare the artifacts caused by metal implants in breast MR images acquired with dual-echo Dixon and two conventional fat-suppression techniques. ⋯ Metal implants introduce artifacts of different types and sizes, according to the different fat-suppression techniques used. The dual-echo Dixon technique produces a larger central void, allowing the implant to be easily identified, but presents a smaller overall artifact volume by obscuring less area in the image, according to a quantitative phantom study.