Probe with chest shielding for improved breast MRI

An analysis is presented of mutually inductive coupling in probe design. It is assumed that near field couplings predominate and that lumped constants may therefore be employed. Using three published designs as examples, analytic techniques are presented for assessing B 1 field strength, losses, and signal-to-noise ratio in increasingly complex situations. The perturbing effect of the B 1 field from a matching coil is examined and it is shown that if the coil is too close to the sample there can be an asymmetry introduced in the rotating frame B 1 field. It is then shown that such asymmetries are potentially a general feature of inductively coupled, loaded coils. The importance of suppressing unwanted resonances is highlighted if tuning and matching are to be orthogonal, a potential advantage of mutually inductive matching. Finally, a lumped-constant simulation is briefly described for those situations where an analytic approach becomes too cumbersome.

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An RF breast coil for 0.2TMRI

Błasiak

Volotovskyy

Tyson

et al. 2015

Concepts Magn Reson

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Breast cancer is the most frequently diagnosed cancer in women. High field studies have shown the diagnostic value of breast MRI, but the examination costs greatly exceed those of competing conventional mammography. Low field MRI offers typical MRI contrast at substantially lower cost, but has suffered from lower spatial resolution. Specificity of breast MRI can potentially be increased by acquiring MR imaging with higher spatial or temporal resolution, but the signal-to-noise ratio (SNR) achievable in a given imaging time becomes limiting. SNR for the particular pulse sequence and magnet field strength is strongly influenced by the characteristics of the radio-frequency coil. An optimal breast coil should yield excellent SNR but also generate a homogeneous B 1 field, while allowing imaging of the both breasts simultaneously and maintaining patient comfort. RF receiver coil design is a key determinant of image quality, thus to address this we have designed and constructed a low field breast imaging coil. The coil was tested with a 4-post 0.2T MRI providing high quality breast images. Designed and constructed saddle rf coil allows to obtain good quality image of the breast using low 0.2 T MRI system within 2 minutes. The coil provides patient comfort as breast compression is not required and minimizes artefacts caused by respiration or motion. A high contrast, lowcost and pain-free breast examination using optimized low field MRI system has the potential to serve a large patient population for whom current technologies have deficiencies.

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Probe with chest shielding for improved breast MRI

Cited by 14 publications

References 18 publications

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Use of mutually inductive coupling in probe design

An RF breast coil for 0.2TMRI

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