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Mammography: Technology and Benefits

Breast cancer is the most frequently diagnosed cancer in Canadian women according to the Canadian Cancer society. A mammogram is a type of diagnostic imaging test that uses low-dose X-ray to examine the breast tissue. It is used to aid in the early detection of breast diseases such as growths or micro-calcifications before they can be felt by hand.

Canada Diagnostic Centres is now offering the following mammography service:

  • Digital Mammography including Computer Aided Detection (CAD)
  • Tomosynthesis
Digital mammography offers the following advantages:
  1. In the recent landmark DMIST (Digital Mammographic Imaging Screening Trial) study, it was found that digital mammography was significantly better in screening women who were under age 50, of any age with heterogeneously or extremely dense breasts and pre- or perimenopausal women of any age.
  2. As an electronic image of the breast is obtained, this allows software algorithms to be applied allowing vastly improved gray scale latitude facilitating improved visualization of tissues of all densities. In addition, as the image is not fixed on film, there is an ability to change the contrast resolution which can aid in diagnostic accuracy
  3. The images can be obtained using a lower average glandular dose than with film mammography without compromising diagnostic accuracy.
  4. The real diagnostic power of digital mammography lies in its ability to serve as a platform for future developments. These developments will further improve the diagnostic accuracy of the modality. Currently, the digital platform has allowed for development of Computer Aided Detection (CAD). This software program assesses abnormal regions such as masses, densities and microcalcifications that will be highlighted requiring further review by the radiologists. Although CAD is currently uninsured by the provincial medical plan, at Canada Diagnostic Centers, it is a complimentary service offered to all patients.

Canada Diagnostic Centres is also now offering tomosynthesis with some diagnostic mammograms. This 3-dimensional imaging technology involves acquiring pictures of a stationary compressed breast at multiple angles. The individual images are then reconstructed into a series of thin high-resolution slices that can be displayed individually or in a series of movie like images. It is used for improved characterization of lesions seen on regular mammographic views. It is also useful for better tissue differentiation and improved visualization when regular mammography has limited sensitivity because of dense breast parenchyma. There is no extra charge to the patient for this state-of-the-art advancement.

According to the Canadian Cancer Society, patients should have a mammogram every two years between the ages of 50-69. Between the ages of 40-49, it is recommended that the patient speak to their doctor about risks of breast cancer. Screening beyond the age of 70 should be performed in consultation with the woman's physician, depending on general health and outlook.

According to the Canadian Breast Cancer Society, breast cancer is the most frequently diagnosed cancer in Canadian women, accounting for an estimated 30% of all cancer cases. However, mortality rates from breast cancer are on the decline because of earlier detection through organized mammography screening programs and improved therapies following surgery.

Mammography