Mr. Parmeet S. Bhatia Profile

Parmeet S. Bhatia

Sr. Scientist

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Publications (3)

Proceedings Article | 16 March 2020 Paper

Knee orientation detection in MR scout scans using 3D U-net

Chen Li, Parmeet Bhatia, Yu Zhao

Proceedings Volume 11314, 113143O (2020) https://doi.org/10.1117/12.2551390

KEYWORDS: Visualization, Tissues, Magnetic resonance imaging, Image segmentation, Matrices, 3D modeling, Image registration, Reconstruction algorithms, 3D scanning, 3D image processing

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Purpose: Detecting knee orientation automatically from scout scans with high speed and accuracy is essential to a successful workflow of MR knee imaging. Although traditional methods of image processing such as rigid image registration and object detection are potentially available solutions, they are sensitive to image noise such as missing features due to the metal implants and anatomical variability in knee size and tissue composition. Method: In this study, a segmentation-based approach was proposed to calculate a 3-D transformation matrix that defined 3-D knee orientation using low-res MR scout scans. Specifically, 3-D U-net was used to segment a plane that was parallel to the knee meniscus plane and reconstruct the plane norm as one of the vectors (v₁) needed for a 3d transformation matrix. A separate model of 3-D U-net was then trained to segment another plane that was perpendicular to the meniscus and reconstruct the plane norm as v₂. A linear 3-D transformation matrix was then obtained for each patient case in 14 testing subjects that were initially manually rotated in small (group S) and large (group L) degrees for training. Angle corrected images were also visually compared against their corresponding ground truth. Results: The average of v₁ and v₂ error in group S were 5.62° and 5.12° , respectively, whereas the error average of these two vectors were 6.65° and 8.25° , respectively for group L. The standard deviation for v₁ and v₂ in group S and L were 2.51° , 2.84° , 5.65° , and 7.65° , respectively. The Dice similarity coefficient (DSC) of reconstructed v₁ and v₂ planes were 0.78, 0.70, 0.71, and 0.65 for group S and L. The qualitative assessment further showed consistent knee representation after correction for knees with heavy distortion and fatty tissue. Conclusion: Initial results suggest that our approach has the potential to automatically correct for small knee rotations commonly seen in clinical setting and is robust even under stress test for knees with anatomical structures (e.g. fatty tissue) that were even absent in the training data set and that appear heavily distorted.

Proceedings Article | 15 March 2019 Presentation + Paper

Volumetric texture modeling using dominant and discriminative binary patterns

Parmeet Bhatia, Amit Kale, Zhigang Peng

Proceedings Volume 10949, 109490H (2019) https://doi.org/10.1117/12.2512296

KEYWORDS: Tumors, Tissues, Databases, Magnetic resonance imaging, Medical research, Medical imaging, Image classification, Analytical research, Binary data, 3D image processing

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Proceedings Article | 24 February 2017 Presentation + Paper

Real time coarse orientation detection in MR scans using multi-planar deep convolutional neural networks

Parmeet Bhatia, Fitsum Reda, Martin Harder, Yiqiang Zhan, Xiang Sean Zhou

Proceedings Volume 10133, 1013303 (2017) https://doi.org/10.1117/12.2254647

KEYWORDS: Target detection, Image processing algorithms and systems, Convolutional neural networks, Detection and tracking algorithms, Visualization, Magnetic resonance imaging, Image segmentation, Image registration, Medical imaging, Neural networks, Convolution, 3D scanning

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