Keys Steps for an Optimal Mammogram
Patient Positioning
Correct positioning of the breast during mammography is extremely important. If the entire breast is not in the x-ray path (field), or if there is something blocking the x-ray field (such as a piece of jewelry, shoulder or the opposite breast), the diagnosis can be compromised. It is also easier to apply proper compression when the breast is positioned correctly.
Patient Cooperation
It is also important that the patient be fully informed about each step of the mammogram procedure to ensure that she can fully participate and cooperate in the exam. During the actual x-ray exposure, patients must remain absolutely still and hold their breath to eliminate image blurring due to patient motion. Women are encouraged to take a few moments prior to the exam to talk to the mammography technologist about any questions or concerns.
Compression
Breast compression is necessary to flatten the breast so that the maximum amount of tissue can be imaged and examined. Breast compression may cause some discomfort, but it only lasts for a brief time during the mammography procedure. Patients should feel firm pressure due to compression but no significant pain. If you feel pain, please inform the technologist. During the mammography examination, breast compression should only be applied two to four times per breast for a few seconds each time.
Breast Compression is Necessary During Mammography in Order to:
Flatten the breast so there is less tissue overlap for better visualization of anatomy and potential abnormalities. For example, inadequate compression can lead to poor imaging of microcalcifications, tiny calcium deposits that are often an early sign of breast cancer.
Allow the use of a lower x-ray dose since a thinner amount of breast tissue is being imaged
Immobilize the breast in order to eliminate image blurring caused by motion
Reduce x-ray scatter which also leads to image degradation
Exposure Settings (Dose)
Breast size, shape and breast tissue density is different for every woman. This requires care in selecting the correct x-ray parameters to make an optimal mammogram image. Larger breasts may require higher x-ray dose; smaller breasts can be imaged properly with less dose.The final image needs to have sufficient spatial resolution (detail) to image small structures such as microcalcifications. The image must also have sufficient contrast so that lumps, cysts and other tissue masses may be clearly seen on the mammogram.
Film and Cassette Screen Combinations
Mammography is a special type of x-ray imaging that uses high contrast, high-resolution film and an x-ray system designed specifically for mammography to create detailed images of the breast. Use of high quality film and screen cassettes is critical to creating the best image quality.
Film Processing
The quality of the dark room equipment and/or film processors is also very important to ensure a final mammogram image with high quality. The film must not be over- or under-exposed. The cassettes and system for processing the film must be dust-free and without light leaks.
ref. http://www.imaginis.com/breasthealth/quality.asp
IMAGINIS.COM BREAST HEALTH NEWSLETTER
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Sunday, March 22, 2009 Volume 11, Issue 3 |
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