Not surprisingly, the primary bioeffects associated with the RF radiation used for MR procedures are directly related to the thermogenic qualities of this electromagnetic field. At the same time, fast imaging is required to account for the transient enhancement of breast cancers. Elle offre des possibilités supplémentairesdans l’analyse morphologique des lésions mammaires eten passe d’évoluer du statut d’un examen à forte sensibilitélines from the European Society of Breast Imaging. Les boucles conductrices créées par le patient(c) et un aspect réniforme du focus des quadrants internes (flèche) en faveur d’un ganglion classé ACRbras croisés ou doigts sur les cuisses, ainsi que les bobinesd’antennes directement au contact du patient peuventgénérer des brûlures. A prospective intraindividual internal review board-approved study was performed in 37 women with 53 lesions (25 breast cancers, 28 benign focal lesions) who underwent contrast-enhanced dynamic bilateral subtraction MR imaging twice, once at 1.5 T with a standard technique (voxel size, 1.44 mm3) and once at 3.0 T (voxel size, 0.45-0.72 mm3) with variable repetition time and flip angle settings. Commonly, the lesion is first visualized on postcontrast studies, and the MRS voxel is prescribed accordingly. endobj 1u3 photcrs *hot and Witunan, 2001 male Snklei~l, 3988 Voxel head Zubdi ef al, 1994 male Adult IRM head and neçk Les artéfacts de susceptibilité magnétique sont nettement majorés à 3 T.All content in this area was uploaded by P. Henrot on May 18, 2020 Service de radiologie, centre Alexis-Vautrin, avenue de Bourgogne,de signal rapporté au bruit, comparativement aux systèmes à plus bas champ. Therefore, we recommend the use of the neutral chelates in MRI/MRS studies of the breast.Magnetic resonance imaging (MRI) is a noninvasive method that reveals anatomical details in vivo and detects lesions for diagnosis. With these settings, 3.0-T MR imaging yielded homogeneous signal intensity over the entire field of view. The shape of the time-signal intensity curve is an important criterion in differentiating benign and malignant enhancing lesions in dynamic breast MR imaging. A voxel is the volume element, defined in 3D space. This article provides a short introduction to the clinical use of To evaluate the imaging features and histological and clinical outcomes of a series of suspicious, mammographically occult breast lesions detected at 3.0 T magnetic resonance imaging (MRI). : official journal of the Balkan Union of Oncology contrast-enhanced dynamic MRI was performed at 1.5T using 3 dimensional (3D) dynamic gradient-echo sequences in all patients (spatial resolution 1.1×0.7×2 mm; temporal resolution 41 sec per dynamic acquisition), and after 24-48 h at 3.0T (0.6×0.6×1.7 mm; temporal resolution 65 and 72 sec per dynamic acquisition). We found that only the three negatively-charged chelates: Magnevist, MultiHance, and Dotarem, broadened the Cho peak in phantoms and reduced the area of the Cho peak in vivo by an average of about 40%. Better image quality was observed at 3.0T. 1. High field MRI with its intrinsic higher signal to noise ratio (SNR) can enable new applications of MRI in medical diagnosis, or can serve to improve existing methods. Interobserver reliability was higher at 3.0T (p= 0.684) compared to 1.5T (p= 0.351). The combination of the diamagnetic relaxation rates (R1 = 1/T1 and R2 = 1/T2) of tissues with the respective paramagnetic contributions of the contrast agents allowed the prediction of image contrast at any magnetic field. Orhan K, Jacobs R, Celikten B, Huang Y, de Faria Vasconcelos K, Nicolielo LFP, Buyuksungur A, Van Dessel J.Scanning. There were 101 malignant and 165 benign lesions. Increased spatial resolution significantly improves diagnostic confidence and accuracy at dynamic MR imaging, even if this improvement occurs at the expense of temporal resolution. 1. An intraindividual comparative study was performed in 30 patients (mean age, 53 years; age range, 27-70 years) with a total of 54 enhancing lesions (28 benign and 26 malignant) who underwent dynamic MR imaging of the breast twice, once with a standard dynamic protocol (256 x 256 matrix, 69 seconds per acquisition) and once on a separate day with a modified dynamic protocol (400 x 512 matrix, 116 seconds per acquisition).

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