Evolution from traditional to digital

Since its inception in the mid-20th century, mammography technology has become an important tool in breast cancer screening. Traditional mammography (also known as "mammography") initially used film for imaging, but with advancements in technology, digital mammography gradually became mainstream. According to the Hong Kong Breast Cancer Foundation, about 4,000 new breast cancer patients are diagnosed in Hong Kong every year, and early detection is essential for treatment. The introduction of digital technology not only improves image quality but also reduces radiation dose, making examinations safer.

Principles and limitations of conventional mammography

Traditional mammography uses film to take X-ray images, and the principle is that the X-rays penetrate the breast tissue and form an image on the film. However, this technique has the following limitations:

• Low image resolution: The image quality of the film is limited by the chemical development process, which can make it difficult to identify subtle lesions.
• The radiation dose is relatively high: Traditional techniques require higher X-rays to ensure image clarity, which has a certain impact on the patient's health.
• Inconvenient storage and transmission: Films must be stored physically and cannot be shared remotely, so they are not useful for inter-ministerial consultations.

furthermoreMammography priceAlthough it is low for traditional technology, the price difference is gradually narrowing due to the spread of digital technology.

Principles and benefits of digital mammography

Digital mammography uses electronic sensors instead of film to convert X-rays directly into digital signals. Its advantages include:

• Higher resolution: Digital images can be enlarged or adjusted to make it easier for doctors to find small calcifications or tumors.
• Low radiation dose: According to data from the Hong Kong Health Bureau, the radiation dose of digital technology has been reduced by about 20%-30% compared to traditional technology.
• Easy to store and transport: Images can be stored in the electronic medical record system, allowing for remote medical treatment and long-term follow-up.

aboutThe Hong Kong Breast Cancer Foundation recommends that women over 40 should be screened every two years, and high-risk groups should be screened annually.

Digital Breast Tomography (3D Mammography)

3D mammography (also known as "tomosynthesis technology") is a further upgrade in digital technology that captures and reconstructs three-dimensional images from multiple angles, with the following characteristics:

• More accurate diagnosis: It is especially suitable for dense breast tissue and can reduce the judgment error caused by tissue overlap.
• Reduce false positives and false negatives: Studies have shown that 3D technology can improve cancer detection rates by 15%-30% while reducing unnecessary biopsies.

However, 3D technologyMammography pricePrivate sector fees in Hong Kong range from around HK$3,000 to HK$5,000 and should be evaluated based on individual needs.

Comparison of different technologies and suggestions for choosing

When choosing a mammography technique, consider the following factors:

furthermoreThe frequency should be adjusted according to age, family history, and breast density, and it is recommended to consult a professional doctor for an individual plan.

Choose the best mammography technique for your situation

Whichever technique you choose, regular screening is key to preventing breast cancer. While digital technology comes at a cost, its accuracy and security make it worth the investment. Public hospitals in Hong Kong are now gradually adopting digital devices, with the private sector offering more 3D options. A woman should choose the most appropriate examination method based on her health, financial capabilities and medical advice.

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