Device for superposed mri and pet imaging

Abstract

A device is disclosed for superposed magnetic resonance imaging and positron emission tomography imaging. The device includes a magnetic resonance imaging magnet which defines a longitudinal axis (z); a magnetic resonance imaging gradient coil (2) arranged radially within the magnetic resonance imaging magnet; a magnetic resonance imaging HF coil (3) arranged radially within the magnetic resonance imaging gradient coil (2); and a multiplicity of positron emission tomography detection units arranged in pairs opposite one another about the longitudinal axis (z). The many positron emission tomography detection units (5) are arranged radially within the magnetic resonance imaging gradient coil (2) and can be inserted into the device and can be removed from the device along the longitudinal axis (z). A carrier tube (7) is preferably provided having a multiplicity of pockets (4), which in each case extend along the longitudinal axis, for accommodating at least one positron emission tomography detection unit (5).

Description

technical field [0001] The invention relates to a device for superimposing MRI images and PET images. Background technique [0002] Magnetic resonance tomography (MRI apparatus) is known to have three main functional parts, which are represented in Figure 5 In the center: the fundamental field system 21 , the gradient system 22 and the high frequency system 23 (also called HF system or body resonator). The basic field system 21 is usually a magnet and provides a strong static magnetic field. The gradient system 22 provides a tunable magnetic field in the low frequency range down to about 1 kHz, which has a linear ramp up or down in one or more directions. The HF system 23 provides an oscillating magnetic field for deflecting nuclear spins in the high frequency range substantially at the nuclear spin resonance frequency (typically 42.45 MHz) given by the static magnetic field, and it can also be used to receive Yu's nuclear spin signal. [0003] In a common magnetic reson...

AI Technical Summary

Problems solved by technology

[0012] Finally, based on the radial positional conditions, there is no possibility at all to shield (for example, through the septum) the ring-shaped PET detector from gamma rays outside the ring-shaped PET detector

[0013] A solution such as highly integrated or linked HF systems and PET detectors, resulting in higher costs for the mechanics and higher costs in the event of failure

Another workaround is to basically unintegrate, as in Image 6 as shown in the reference example, but the resulting relatively large location requirements

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