求翻译：While new for detecting breast cancer, molecular imaging has been used for cardiac patients for decades. For breast screening, the patient is injected with a radioactive tracer that is absorbed by all the cells in the body. The tracing agent emits invisible gamma rays, which are detected by the Imaging camera and translated into a digital image of the breast. Abnormal cells absorb a greater amount of the tracing agent than non-cancerous cells and show up as “hot spots.” This method helps physicians more reliably differentiate cancerous from non-cancerous cells. Other modalities such as Mammography and Ultrasound image the physical structure of the breast. Like MRI, BSGI captures the cellular functioning of the breast tissue.是什么意思？

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