A semi-open nuclear magnetic resonance imaging system and its application in breast imaging

Abstract

The invention discloses a semi-open nuclear magnetic resonance imaging system. The semi-open nuclear magnetic resonance imaging system comprises a magnet housing, an iron yoke fixing seat arranged in the magnet housing, a semi-ring type permanent magnet arranged on the iron yoke fixing seat, a two-dimensional gradient coil arranged on the semi-ring type permanent magnet and close to the open position of the semi-ring type permanent magnet, two hemispherical radio-frequency coils arranged in the semi-ring type permanent magnet and mammary gland supporting plates fixedly connected with the two hemispherical radio-frequency coils. The semi-open nuclear magnetic resonance imaging system has the advantages that compared with a fine standard mammary gland photography technique, the carcinogenic risk caused by ionizing radiation is not produced; compared with an ultrasonic mammary gland screening technique, and nuclear magnetic resonance images are good in soft tissue resolution and have higher specificity and sensitivity; compared with an existing clinic nuclear magnetic resonance mammary gland examination technique, the semi-open nuclear magnetic resonance imaging system is low in device cost, movable, small in limitation to patients, convenient and quick to operate and convenient to position during examination and can be popularized in a large number of township hospitals and can utilize larger constant gradient of the magnet itself to achieve diffusion analysis and diffusion imaging.

Description

technical field [0001] The invention relates to a semi-open nuclear magnetic resonance imaging system and its application in breast imaging. Background technique [0002] Breast cancer is the most common tumor in women (accounting for 31%), and breast cancer has always been the second cause of cancer death in women. In 2008, The International Agency for Research on Cancer (IARC) reported that the incidence of cancer worldwide increased by 20%, and the death rate from cancer increased by 14%. In 2012 alone, 1.67 million new cancer cases and 520,000 cancer deaths were reported. [0003] Over the years, mammography (soft radiography based on mammography) has been proven to be an effective way to detect breast cancer at an early stage and thereby reduce breast cancer mortality. In view of the increase in the incidence of breast cancer in women, some other examination methods including ultrasound and physical palpation are also used in the early diagnosis of breast cancer, but ...

AI Technical Summary

Problems solved by technology

[0005]1 Accuracy problem: It is already known that traditional mammography has a high false positive rate of malignant tumors (60%-80%), resulting in a large number of unnecessary tissue biopsy

For example, the literature published by Radiology in 2012 showed that people who have received at least one radiation examination have a 7% increased risk of various cancers than those who have never received radiation examinations

7% indicates a deterministic effect, so for young women, if breast screening is performed in advance and the screening interval is shortened, the risk of breast cancer itself will increase

The patient adopts a prone position, and the whole body enters the magnet cavity, and the patient is subject to large limitations and strong examination noise; in addition, it takes a lot of time to set up the position

[0014] It is not easy to enter township hospitals, and it is not easy to popularize: According to the statistics of the World Health Organization, 52.9% of the global incidence of breast cancer and 62.1% of the death rate are in underdeveloped areas

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