Abstract: A phantom for an MRI system is provided. The phantom includes a third layer, the third layer including a first structure and a second structure, the first structure including two adjacent wedge-shaped objects in opposite directions which do not generate magnetic resonance signals, the second structure includes a first module group pair, the first module group pair including a first module group and a second module group, the first module group and the second module group each including multiple modules which are identical to each other, aligned with each other and separated from each other by the same distance, and the first module group and the second module group are perpendicular to each other. The phantom for an MRI system can satisfy measurement of multiple image quality indices such as layer thickness and resolution at the same time, which saves a large amount of repetitive work and time.

Abstract: A phantom for an MRI system is provided. The phantom includes a third layer, the third layer including a first structure and a second structure, the first structure including two adjacent wedge-shaped objects in opposite directions which do not generate magnetic resonance signals, the second structure includes a first module group pair, the first module group pair including a first module group and a second module group, the first module group and the second module group each including multiple modules which are identical to each other, aligned with each other and separated from each other by the same distance, and the first module group and the second module group are perpendicular to each other. The phantom for an MRI system can satisfy measurement of multiple image quality indices such as layer thickness and resolution at the same time, which saves a large amount of repetitive work and time.

Abstract: A ventilation device for an MRI system and an MRI system are presented. The ventilation device has a fan and an adjustment component. The fan is used to generate a flow of air past an examination subject in the MRI system, and the adjustment component is used to adjust an operating parameter of the fan according to a heat signal indicating variation of heat in the examination subject. The ventilation device and MRI system enhance the user's experience of the MRI system, increase the examination subject's ability to undergo examinations of high SAR and long duration, and reduce medical risks associa.