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Publication Date: 2015-Sep-15
Document File: 7 page(s) / 284K

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An optimized MRI RF coil for integration with in-bore therapy or biopsy system is disclosed. Inside the gradient coil, the RF coil is optimally designed into an open Ω shape to allow a much bigger room for the in-bore treatment system for therapy or biopsy. Horizontal rails as well as coil support brackets are integrated with a body coil. A patient handling system, cradle with the wheels is able to move on the rails to transmit a patient, such that, the in-bore treatment system can have bigger space, and consequently, the RF coil design can have bigger power. The optimized RF coil design is also separated from high voltage parts on RF body coil, which reduces electromagnetic (EM) interference in the RF coil. Further since gradient coil is cured in a whole piece, the gradient coil is much thicker than the body coil and does not have any cut in internal diameter (ID), and thereby safety issue due to liquid leakage is greatly reduced.

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The present invention relates generally to magnetic resonance imaging (MRI) radiofrequency (RF) coils and more particularly to a technique of integrating MRI RF coil with in-bore therapy or biopsy system.

An upcoming trend in medical industry is integration of therapeutic modality with diagnostic modalities such as magnetic resonance imaging (MRI). For example, high intensity focused ultrasound (HIFU) or shock wave lithotripsy (SWL) and laser treatment system is seen to be integrated with MRI. Such an integrated treatment system provides anatomy location of tissue and/or probe, and/or temperature information. Location information, such as tumor position, provides information for focused application if high intensity. In hyperthermia therapy, such as, HIFU, temperature information provides progress of the HIFU treatment, as the treatment is accompanied with an increase in temperature. Figure 1 depicts an MRI guided HIFU system.

Figure 1

As depicted in Figure 1, HIFU module (6) is limited within a cradle area (5). The RF coil (2) is a round and placed inside a gradient coil (1). The cradle is supported by a bracket called bridge (3) and wheels (4). The RF coil and the cradle are required to be adjusted to align with each other during installation. Such adjustment is usually a challenge.

Several other shortcomings, related with RF coil design exist in such integrated MRI guided treatment or biopsy system. For example, electromagnetic disturbance exists between therapy or biopsy system and RF coil, especially when the two systems are close to each other and operated simultaneously. Further, HIFU system and some SWL devices include liquid tanks with specific acoustic properties. Conventional integrated systems face the challenge of tank leakage which is a fatal failure mode as the RF coil beneath the liquid tank is a high voltage part. Also, due to a complex assembly of a bridge, cradle and the treatment along with therapy biopsy system, the liquid is hard to clean. Furthermore, high performance treatment system is difficult to apply due to small bore size of MRI. Since high power equipment usually has large dimension, positioning of high power HIFU or SWL system inside the bore is difficult. Also, there exists an inaccuracy of relative position between B1 field generated by the RF coil and a control position of the treatment system. The control position of the treatment system is related to the bridge rail position and separated from the RF coil.

One conventional technique includes a device for performing breast biopsy and/or therapy within an MRI system. Figure 2 depicts the device for performing breast biopsy and/or therapy.

Figure 2

The device depicted in Figure 2, includes a structure for performing biopsy that is placed inside the magnet bore of the MRI apparatus. Consequently, space for performing biopsy is limited to co...