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Breast imaging

Breast-Specific Gamma Imaging (BSGI)

a molecular adjunctive procedure to mammography

Breast-Specific Gamma Imaging (BSGI). BSGI is a nuclear medicine procedure based on the same principles as scintimammography.Though the latter had shown promise as a diagnostic tool for the detection of breast cancer and the differentiation between benign and malignant tumours, the standard gamma cameras used did not allow for the reliable detection of very small lesions. Neither did they allow for direct correlation to mammograms. BSGI is a functional imaging technique that overcomes the limitations of scintimammography by utilising a high-resolution, anatomic-specific gamma camera to image the metabolic activity of breast lesions through radiotracer uptake. The technique has a specificity value of 97% and a high sensitivity for detecting lesions as small as 3 mm. It has proven to be of value when postmammogram evaluation is indicated, especially when women present with dense breast tissue, multiple suspicious lesions, implants or palpable lesions not detected by ultrasound.Furthermore, a BSGI exam can be performed immediately following mammography for same-day evaluation at the point of care. The Dilon 6800 is a novel, small-fieldof-view gamma camera specifically designed for BSGI exams of the breast. The system features a high-resolution detector with a 6-in. x 8 in. field of view. With a negative predictive value (NPV)of more than 96%, the system's capability of differentiating benign from malignant masses is strong. The detector can be easily positioned in direct contact with the breast and the chest wall, significantly improving spatial resolution, and can fully rotate around the breast to reach multiple acquisition angles and duplicate standard mammographic views. It is possible to study so-called "hard-to-reach" areas, such as the medial aspect of the breast. A gamma isolation shield eliminates shine-through and minimises scatter radiation from nearby organs. A complementary gamma-guided biopsy probe is planned for completion in 2006. Breast-Specific Gamma Imaging (BSGI)

Dilon Technologies, LLC

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