ISSN:0899-3459    

出版商:OVID    

年代:1995

数据来源: OVID

ISSN:0899-3459    

出版商:OVID    

年代:1995

数据来源: OVID

摘要:

To perform magnetic resonance imaging of the female pelvis, one must be familiar with the imaging appearance of normal structures as well as the disease entities that may be cncountered. However, it is also important to be familiar with and understand the basic physical principles of the available imaging techniques to be able to optimize image quality and the detection of abnormalities. This discussion is intended to describe the available imaging techniques used in evaluation of the female pelvis. Following a discussion of conventional spin echo (CSE) techniques, the fast spin echo (FSE) technique will be described in detail. This will include how the FSE sequence generates images, the choice of imaging parameters, and the unique contrast characteristics and artifacts associated with the FSE technique. Pelvic multicoils will also be described in detail, including the choice of imaging parameters when using these coils and the unique artifacts that can be encountered. Chemical-selective imaging and motion artifact reduction techniques will additionally be described. At the end of the discussion, suggested imaging parameters are given for CSE and FSE sequences and for body coil and multicoil imaging.

ISSN:0899-3459    

出版商:OVID    

年代:1995

数据来源: OVID

摘要:

Magnetic resonance imaging (MRI) can contribute to cost-effective management in women with suspected myomas or adenomyosis and can provide precise presurgical mapping prior to myomectomy or correction of mullerian duct anomalies. MRI is also valuable in patients with suspected adnexal masses that are not detected sonographically or where definitive diagnosis of juxtauterine myoma, cystic teratoma, or hemorrhagic mass may alter management.

ISSN:0899-3459    

出版商:OVID    

年代:1995

数据来源: OVID

摘要:

Malignancies of the female genital tract account for 25% of all cancers diagnosed in women. The decreasing incidence and mortality associated with cervical and uterine corpus carcinomas reflect earlier detection and improved therapies. Although not practical as a screening tool, magnetic resonance imaging is playing an expanding role in the diagnosis and staging of gynecologic cancers. Its unsurpassed soft tissue contrast resolution and multiplanar imaging capabilities allow better depiction of depth of tumor invasion and extent of local spread than cither computed tomography or ultrasound.

ISSN:0899-3459    

出版商:OVID    

年代:1995

数据来源: OVID

摘要:

Prostate cancer is the most common cancer in the world, the most frequently diagnosed in the United States, and the second most lethal cancer in U.S. men. Earlier diagnosis implies better prognosis. However, prognosis may be dependent upon the stage of the malignancy at the time of diagnosis and implementation of appropriate therapy. Clinical staging, even with the development of serum prostate-specific antigen and other studies, has not proven to be highly accurate, particularly to identify and quantitate local disease and extension. Imaging has, in the past, also had limited success. With the development of computed tomography (CT), endorectal ultrasound, and magnetic resonance imaging (MRI). there was great expectations for improvement. However. CT and ultrasound have not been as accurate as hoped. MRI, because of its multiorientation and multiparameter abilities, has been the most definitive imaging tool for staging of local extension, yet still has limitations. The prostate capsule, the neurovascular bundles, the seminal vesicle, and other regions prone to initial attack by cancer extension can be seen exquisitely clearly by the newer approaches to MRI. Cancer extension, however, cannot be consistently identified when it is microscopic. MRI is an accurate identifier of macroscopic, even subtle macroscopic disease, but there are still limitations in its ability to diagnose all pathology.

ISSN:0899-3459    

出版商:OVID    

年代:1995

数据来源: OVID