AJR. American journal of roentgenology
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AJR Am J Roentgenol · Oct 1994
Comparative StudyFat-suppressed spoiled GRASS imaging of knee hyaline cartilage: technique optimization and comparison with conventional MR imaging.
We studied healthy volunteers with fat-suppressed three-dimensional (3D) spoiled gradient-recalled acquisition in the steady state (SPGR) to determine parameters that maximize positive contrast between knee articular cartilage and fluid, marrow fat, and muscle; and we compared the technique with conventional MR imaging sequences. The purpose was to determine if fat-suppressed 3D SPGR imaging is useful for detecting abnormalities of the articular cartilages. ⋯ When a fat-suppressed 3D SPGR sequence of 60/5/40 degrees (TR/TE/flip angle) is used, MR images can show high positive contrast between articular hyaline cartilage and adjacent structures. This convenient technique is different from standard MR imaging sequences because it demonstrates greater signal intensity in cartilage than in fluid, marrow fat, and muscle, and because it consistently shows an organized internal architecture of hyaline cartilage. Fat-suppressed 3D SPGR imaging therefore has promise for detecting abnormalities of the articular cartilage.
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AJR Am J Roentgenol · Sep 1994
Endoscopic sonography of the stomach: findings in benign and malignant lesions.
Endoscopic sonography combines direct visualization of the luminal surface of the gut with sonographic examination of the gut wall and surrounding structures. Lesions arising from different layers of the wall can be identified, staged, and in some cases characterized. ⋯ A thorough examination with endoscopic sonography may determine the layer of origin, size, echogenicity, and extent of gastric lesions and allows differentiation of lesions arising in the stomach from lesions arising outside the stomach. The purpose of this essay is to illustrate the findings from endoscopic sonography of a variety of benign and malignant lesions of the stomach.
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AJR Am J Roentgenol · Sep 1994
Reference citations in radiology: accuracy and appropriateness of use in two major journals.
Errors in reference citation and use are common in the medical and scientific literature. The prevalence of such errors in the radiology literature has not been reported. We did a study to assess the accuracy and appropriateness of use of references cited in two general radiology journals. ⋯ The rate of minor errors in accuracy of references is fairly high in the two journals studied and is comparable to rates previously reported for other types of journals. The rate of major errors in accuracy of references is slightly lower than rates for other types of journals. The percentage of cited references that could not be located was also smaller than in previous reports. Errors in citation appropriateness were less common as well. Given the small number of errors that prevented references from being located, significant expenditure of time and money by journal staff members in checking references is probably not justified. However, authors should be encouraged to exercise greater care in checking all of their references for both accuracy and appropriateness of use. Differences in error rates between AJR and Radiology may have resulted in part from the random sampling method, which produced different mixtures of index articles for the two journals.
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AJR Am J Roentgenol · Aug 1994
Diagnosis of intracranial lymphoma in patients with AIDS: value of 201TI single-photon emission computed tomography.
Although the prevalence of intracranial lymphoma is high among patients with AIDS, current imaging techniques are not reliable for differentiating this tumor from other common nonneoplastic lesions, such as those seen in toxoplasmosis. The purpose of this study was to prospectively investigate the use of 201Tl single-photon emission computed tomography (SPECT) in identifying intracranial lymphoma in patients with AIDS. ⋯ This preliminary study indicates that 201Tl SPECT might be a useful, noninvasive method for differentiating intracranial lymphoma from nonneoplastic lesions in patients with AIDS.
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AJR Am J Roentgenol · Aug 1994
ReviewLymphoproliferative disorders of the lung: histopathology, clinical manifestations, and imaging features.
The lymphoproliferative disorders represent a spectrum of lymphoid abnormalities that can involve the chest. Plasma cell granuloma, pseudolymphoma, posttransplantation lymphoproliferative disorders, lymphoid interstitial pneumonia, and lymphomatoid granulomatosis involve the pulmonary parenchyma, whereas Castleman's disease, infectious mononucleosis, and angioimmunoblastic lymphadenopathy with dysproteinemia involve intrathoracic lymph nodes. Recent immunohistochemical techniques give us a better understanding of the lymphoproliferative disorders. Clinical and radiologic features often allow differentiation of the lymphoproliferative disorders from the more common aggressive lymphomas.