MR Apparatus Thick Slice MIP for MRCP Motion Artifacts
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Solution Overview
Problem
Magnetic resonance cholangiopancreatography (MRCP) imaging requires long data acquisition periods, leading to inconsistent MR images due to patient movement, resulting in ghost artifacts and potentially unusable images, which necessitates repeated procedures and high additional costs.
Innovation Solution
The method involves acquiring MR data in two-dimensional thick slices with varying slice directions, allowing for faster data acquisition in one breath hold and reconstruction into maximum intensity projections, reducing the impact of patient movement and enabling more stable images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If three-dimensional data acquisition with long echo time is used for MRCP, then high-resolution imaging is achieved, but data acquisition time increases requiring multiple breath holds
Solution Approach 1:
The three-dimensional volume is segmented into multiple two-dimensional thick slices (15-20 mm thickness) with different orientations. Each slice is acquired independently and quickly, then reconstructed to form maximum intensity projections that collectively represent the volume, avoiding the need for long 3D acquisition
Solution Approach 2:
The approach transitions from three-dimensional data acquisition to two-dimensional thick slice imaging. By acquiring multiple 2D slices with different orientations and reconstructing them via maximum intensity projection, the method achieves 3D visualization capability with 2D acquisition speed
2Volume of stationary object
If data acquisition is extended over multiple breath holds, then complete volume coverage is achieved, but patient movement causes inconsistent MR data
Solution Approach 1:
The volume is divided into multiple thick slices that can be acquired quickly within one breath hold. This segmentation allows complete volume coverage to be achieved through multiple rapid 2D acquisitions rather than a single long 3D acquisition, reducing the impact of patient movement
Solution Approach 2:
Each thick slice (15-20 mm) provides overlapping coverage that exceeds the minimum required for complete volume visualization. This excessive sampling in the thickness direction ensures that even with patient movement, sufficient data is captured for reliable maximum intensity projection reconstruction
3Quantity of substance
If multiple breath holds are required for data acquisition, then complete imaging is achieved, but ghost artifacts and fuzzy images occur due to patient movement
Solution Approach 1:
By segmenting the volume into multiple thick slices acquired in separate breath holds, the method isolates movement artifacts to individual slices rather than affecting the entire volume. Each slice is reconstructed independently, limiting the propagation of artifacts
Solution Approach 2:
Multiple thick slices are acquired from different orientations and reconstructed into separate maximum intensity projection images. These multiple copies of the volume from different angles allow selection of the best quality images for diagnosis, compensating for movement artifacts in individual slices
4Volume of stationary object
If three-dimensional data acquisition is used, then comprehensive volume imaging is achieved, but acquisition speed is slow requiring repeated procedures
Solution Approach 1:
The 3D volume is segmented into multiple 2D thick slices that can be acquired rapidly using standard 2D imaging sequences. This segmentation enables parallel or sequential acquisition of all necessary data within a single breath hold, dramatically improving acquisition speed while maintaining volume imaging capability
Solution Approach 2:
The method uses 2D thick slice acquisition instead of 3D volumetric acquisition. By acquiring multiple 2D slices with different orientations and reconstructing them via maximum intensity projection, the system achieves 3D visualization with 2D acquisition speed, improving productivity by a factor of several times
Data Source
AI summary
In a method and magnetic resonance (MR) apparatus for creating a maximum intensity projection of a volume of an examination subject, MR data are acquired for a number of slices of the volume, and an MR image is reconstructed for each of the slices that MR data have acquired in order to create a maximum intensity projection for each of the slices. The maximum intensity projection of the respective slice is shown on a display. The slices, which have a thickness of at least 15 mm, have various slice directions, in order to display the maximum intensity projections from various directions.