Auto‐segmentation of thoraco‐abdominal organs in pediatric dynamic MRI
Purpose Dynamic magnetic resonance imaging (dMRI) is a practical imaging modality for capturing information about regional thoracic‐abdominal components and their dynamics in healthy children and pediatric patients with thoracic insufficiency syndrome (TIS). We propose an auto‐segmentation set‐up fo...
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| Published in: | Medical physics (Lancaster) Vol. 52; no. 11; pp. e70104 - n/a |
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| Main Authors: | , , , , , , , , , , , , , , , , |
| Format: | Journal Article |
| Language: | English |
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01.11.2025
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| ISSN: | 0094-2405, 2473-4209, 2473-4209 |
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| Abstract | Purpose
Dynamic magnetic resonance imaging (dMRI) is a practical imaging modality for capturing information about regional thoracic‐abdominal components and their dynamics in healthy children and pediatric patients with thoracic insufficiency syndrome (TIS). We propose an auto‐segmentation set‐up for the lungs, kidneys, liver, spleen, and thoraco‐abdominal skin outer boundary (Skn) in dMRI images.
Methods
The segmentation setup has been implemented in two steps, recognition and delineation, using two deep neural network (DL) architectures, DL‐R and DL‐D for the recognition and delineation steps, respectively. The encoder‐decoder framework in DL‐D utilizes features at four different resolution levels to counter the challenges involved in segmentation. dMRI sagittal slice acquisitions of 189 (near‐)normal subjects were evaluated, with an in‐plane spatial resolution of roughly 1 × 1 mm2 with 6.00 mm spacing between slices. We utilized images from 89 and 10 subjects at end inspiration for training and validation, respectively. For testing, we experimented with three scenarios utilizing: (1) the images of the 90 (=189‐89‐10) remaining subjects at end inspiration for testing, (2) the images of the remaining 90 subjects at end expiration for testing, and (3) the images of the other 99 (=89+10) subjects at end expiration for testing. In some situations, we can take advantage of the already available ground truth (GT) segmentation for an object in a subject at a particular respiratory phase to automatically segment the same object in the same subject at a different respiratory phase, and then refine the segmentation to create the final GT for all respiratory phases in the image of a subject. We anticipate that this process of creating GT would require minimal post hoc correction. In this spirit, we conducted separate experiments where we assumed to have GT of test subjects at the end expiration for scenario (1), end inspiration for (2), and end inspiration for (3). A major contribution in this paper is the different scenarios of training and testing that we have extensively evaluated with respect to respiratory phases and the subjects to which the images in the training and testing sets belong.
Results
Among these three scenarios of testing, for DL‐R, we achieve the best average location error (LE) of about 1 voxel for the lungs, kidneys, and spleen, and 1.5 voxels for the liver and Skn. The standard deviation (SD) of LE is about 1 or 2 voxels. For DL‐D, we achieve an average Dice coefficient (DC) of about 0.92 to 0.94 for the lungs, 0.82 for the kidneys, 0.90 for the liver, 0.81 for the spleen, and 0.93 for Skn. The SD of DC is lower (0.02 to 0.07) for the lungs, liver, and Skn and slightly higher (0.06 to 0.12) for the spleen and kidneys.
Conclusions
Motivated by applications in surgical planning for disorders such as TIS, adolescent idiopathic scoliosis, and early onset scoliosis, we have created an auto‐segmentation system for thoraco‐abdominal organs in dMRI acquisitions. This proposed setup copes with the challenges posed by low resolution, motion blur, inadequate contrast, and image intensity non‐standardness in dMRI images quite well. |
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| AbstractList | Dynamic magnetic resonance imaging (dMRI) is a practical imaging modality for capturing information about regional thoracic-abdominal components and their dynamics in healthy children and pediatric patients with thoracic insufficiency syndrome (TIS). We propose an auto-segmentation set-up for the lungs, kidneys, liver, spleen, and thoraco-abdominal skin outer boundary (Skn) in dMRI images.PURPOSEDynamic magnetic resonance imaging (dMRI) is a practical imaging modality for capturing information about regional thoracic-abdominal components and their dynamics in healthy children and pediatric patients with thoracic insufficiency syndrome (TIS). We propose an auto-segmentation set-up for the lungs, kidneys, liver, spleen, and thoraco-abdominal skin outer boundary (Skn) in dMRI images.The segmentation setup has been implemented in two steps, recognition and delineation, using two deep neural network (DL) architectures, DL-R and DL-D for the recognition and delineation steps, respectively. The encoder-decoder framework in DL-D utilizes features at four different resolution levels to counter the challenges involved in segmentation. dMRI sagittal slice acquisitions of 189 (near-)normal subjects were evaluated, with an in-plane spatial resolution of roughly 1 × 1 mm2 with 6.00 mm spacing between slices. We utilized images from 89 and 10 subjects at end inspiration for training and validation, respectively. For testing, we experimented with three scenarios utilizing: (1) the images of the 90 (=189-89-10) remaining subjects at end inspiration for testing, (2) the images of the remaining 90 subjects at end expiration for testing, and (3) the images of the other 99 (=89+10) subjects at end expiration for testing. In some situations, we can take advantage of the already available ground truth (GT) segmentation for an object in a subject at a particular respiratory phase to automatically segment the same object in the same subject at a different respiratory phase, and then refine the segmentation to create the final GT for all respiratory phases in the image of a subject. We anticipate that this process of creating GT would require minimal post hoc correction. In this spirit, we conducted separate experiments where we assumed to have GT of test subjects at the end expiration for scenario (1), end inspiration for (2), and end inspiration for (3). A major contribution in this paper is the different scenarios of training and testing that we have extensively evaluated with respect to respiratory phases and the subjects to which the images in the training and testing sets belong.METHODSThe segmentation setup has been implemented in two steps, recognition and delineation, using two deep neural network (DL) architectures, DL-R and DL-D for the recognition and delineation steps, respectively. The encoder-decoder framework in DL-D utilizes features at four different resolution levels to counter the challenges involved in segmentation. dMRI sagittal slice acquisitions of 189 (near-)normal subjects were evaluated, with an in-plane spatial resolution of roughly 1 × 1 mm2 with 6.00 mm spacing between slices. We utilized images from 89 and 10 subjects at end inspiration for training and validation, respectively. For testing, we experimented with three scenarios utilizing: (1) the images of the 90 (=189-89-10) remaining subjects at end inspiration for testing, (2) the images of the remaining 90 subjects at end expiration for testing, and (3) the images of the other 99 (=89+10) subjects at end expiration for testing. In some situations, we can take advantage of the already available ground truth (GT) segmentation for an object in a subject at a particular respiratory phase to automatically segment the same object in the same subject at a different respiratory phase, and then refine the segmentation to create the final GT for all respiratory phases in the image of a subject. We anticipate that this process of creating GT would require minimal post hoc correction. In this spirit, we conducted separate experiments where we assumed to have GT of test subjects at the end expiration for scenario (1), end inspiration for (2), and end inspiration for (3). A major contribution in this paper is the different scenarios of training and testing that we have extensively evaluated with respect to respiratory phases and the subjects to which the images in the training and testing sets belong.Among these three scenarios of testing, for DL-R, we achieve the best average location error (LE) of about 1 voxel for the lungs, kidneys, and spleen, and 1.5 voxels for the liver and Skn. The standard deviation (SD) of LE is about 1 or 2 voxels. For DL-D, we achieve an average Dice coefficient (DC) of about 0.92 to 0.94 for the lungs, 0.82 for the kidneys, 0.90 for the liver, 0.81 for the spleen, and 0.93 for Skn. The SD of DC is lower (0.02 to 0.07) for the lungs, liver, and Skn and slightly higher (0.06 to 0.12) for the spleen and kidneys.RESULTSAmong these three scenarios of testing, for DL-R, we achieve the best average location error (LE) of about 1 voxel for the lungs, kidneys, and spleen, and 1.5 voxels for the liver and Skn. The standard deviation (SD) of LE is about 1 or 2 voxels. For DL-D, we achieve an average Dice coefficient (DC) of about 0.92 to 0.94 for the lungs, 0.82 for the kidneys, 0.90 for the liver, 0.81 for the spleen, and 0.93 for Skn. The SD of DC is lower (0.02 to 0.07) for the lungs, liver, and Skn and slightly higher (0.06 to 0.12) for the spleen and kidneys.Motivated by applications in surgical planning for disorders such as TIS, adolescent idiopathic scoliosis, and early onset scoliosis, we have created an auto-segmentation system for thoraco-abdominal organs in dMRI acquisitions. This proposed setup copes with the challenges posed by low resolution, motion blur, inadequate contrast, and image intensity non-standardness in dMRI images quite well.CONCLUSIONSMotivated by applications in surgical planning for disorders such as TIS, adolescent idiopathic scoliosis, and early onset scoliosis, we have created an auto-segmentation system for thoraco-abdominal organs in dMRI acquisitions. This proposed setup copes with the challenges posed by low resolution, motion blur, inadequate contrast, and image intensity non-standardness in dMRI images quite well. Purpose Dynamic magnetic resonance imaging (dMRI) is a practical imaging modality for capturing information about regional thoracic‐abdominal components and their dynamics in healthy children and pediatric patients with thoracic insufficiency syndrome (TIS). We propose an auto‐segmentation set‐up for the lungs, kidneys, liver, spleen, and thoraco‐abdominal skin outer boundary (Skn) in dMRI images. Methods The segmentation setup has been implemented in two steps, recognition and delineation, using two deep neural network (DL) architectures, DL‐R and DL‐D for the recognition and delineation steps, respectively. The encoder‐decoder framework in DL‐D utilizes features at four different resolution levels to counter the challenges involved in segmentation. dMRI sagittal slice acquisitions of 189 (near‐)normal subjects were evaluated, with an in‐plane spatial resolution of roughly 1 × 1 mm2 with 6.00 mm spacing between slices. We utilized images from 89 and 10 subjects at end inspiration for training and validation, respectively. For testing, we experimented with three scenarios utilizing: (1) the images of the 90 (=189‐89‐10) remaining subjects at end inspiration for testing, (2) the images of the remaining 90 subjects at end expiration for testing, and (3) the images of the other 99 (=89+10) subjects at end expiration for testing. In some situations, we can take advantage of the already available ground truth (GT) segmentation for an object in a subject at a particular respiratory phase to automatically segment the same object in the same subject at a different respiratory phase, and then refine the segmentation to create the final GT for all respiratory phases in the image of a subject. We anticipate that this process of creating GT would require minimal post hoc correction. In this spirit, we conducted separate experiments where we assumed to have GT of test subjects at the end expiration for scenario (1), end inspiration for (2), and end inspiration for (3). A major contribution in this paper is the different scenarios of training and testing that we have extensively evaluated with respect to respiratory phases and the subjects to which the images in the training and testing sets belong. Results Among these three scenarios of testing, for DL‐R, we achieve the best average location error (LE) of about 1 voxel for the lungs, kidneys, and spleen, and 1.5 voxels for the liver and Skn. The standard deviation (SD) of LE is about 1 or 2 voxels. For DL‐D, we achieve an average Dice coefficient (DC) of about 0.92 to 0.94 for the lungs, 0.82 for the kidneys, 0.90 for the liver, 0.81 for the spleen, and 0.93 for Skn. The SD of DC is lower (0.02 to 0.07) for the lungs, liver, and Skn and slightly higher (0.06 to 0.12) for the spleen and kidneys. Conclusions Motivated by applications in surgical planning for disorders such as TIS, adolescent idiopathic scoliosis, and early onset scoliosis, we have created an auto‐segmentation system for thoraco‐abdominal organs in dMRI acquisitions. This proposed setup copes with the challenges posed by low resolution, motion blur, inadequate contrast, and image intensity non‐standardness in dMRI images quite well. Dynamic magnetic resonance imaging (dMRI) is a practical imaging modality for capturing information about regional thoracic-abdominal components and their dynamics in healthy children and pediatric patients with thoracic insufficiency syndrome (TIS). We propose an auto-segmentation set-up for the lungs, kidneys, liver, spleen, and thoraco-abdominal skin outer boundary (Skn) in dMRI images. The segmentation setup has been implemented in two steps, recognition and delineation, using two deep neural network (DL) architectures, DL-R and DL-D for the recognition and delineation steps, respectively. The encoder-decoder framework in DL-D utilizes features at four different resolution levels to counter the challenges involved in segmentation. dMRI sagittal slice acquisitions of 189 (near-)normal subjects were evaluated, with an in-plane spatial resolution of roughly 1 × 1 mm with 6.00 mm spacing between slices. We utilized images from 89 and 10 subjects at end inspiration for training and validation, respectively. For testing, we experimented with three scenarios utilizing: (1) the images of the 90 (=189-89-10) remaining subjects at end inspiration for testing, (2) the images of the remaining 90 subjects at end expiration for testing, and (3) the images of the other 99 (=89+10) subjects at end expiration for testing. In some situations, we can take advantage of the already available ground truth (GT) segmentation for an object in a subject at a particular respiratory phase to automatically segment the same object in the same subject at a different respiratory phase, and then refine the segmentation to create the final GT for all respiratory phases in the image of a subject. We anticipate that this process of creating GT would require minimal post hoc correction. In this spirit, we conducted separate experiments where we assumed to have GT of test subjects at the end expiration for scenario (1), end inspiration for (2), and end inspiration for (3). A major contribution in this paper is the different scenarios of training and testing that we have extensively evaluated with respect to respiratory phases and the subjects to which the images in the training and testing sets belong. Among these three scenarios of testing, for DL-R, we achieve the best average location error (LE) of about 1 voxel for the lungs, kidneys, and spleen, and 1.5 voxels for the liver and Skn. The standard deviation (SD) of LE is about 1 or 2 voxels. For DL-D, we achieve an average Dice coefficient (DC) of about 0.92 to 0.94 for the lungs, 0.82 for the kidneys, 0.90 for the liver, 0.81 for the spleen, and 0.93 for Skn. The SD of DC is lower (0.02 to 0.07) for the lungs, liver, and Skn and slightly higher (0.06 to 0.12) for the spleen and kidneys. Motivated by applications in surgical planning for disorders such as TIS, adolescent idiopathic scoliosis, and early onset scoliosis, we have created an auto-segmentation system for thoraco-abdominal organs in dMRI acquisitions. This proposed setup copes with the challenges posed by low resolution, motion blur, inadequate contrast, and image intensity non-standardness in dMRI images quite well. |
| Author | Tong, Yubing Tong, Leihui Odhner, Dewey Mcdonough, Joseph M. Al‐Noury, Mostafa Kogan, Rachel Torigian, Drew A. Wu, Caiyun Anari, Jason B. Lott, Carina Hosseini, Mahdie Udupa, Jayaram K. Cahill, Patrick J. Mannikeri, Samarth Clark, Abigail Akhtar, Yusuf Liu, Tiange |
| Author_xml | – sequence: 1 givenname: Yusuf surname: Akhtar fullname: Akhtar, Yusuf organization: Vellore Institute of Technology, Katpadi – sequence: 2 givenname: Jayaram K. surname: Udupa fullname: Udupa, Jayaram K. email: jay@pennmedicine.upenn.edu organization: University of Pennsylvania – sequence: 3 givenname: Yubing surname: Tong fullname: Tong, Yubing organization: University of Pennsylvania – sequence: 4 givenname: Tiange surname: Liu fullname: Liu, Tiange organization: University of Science and Technology Beijing – sequence: 5 givenname: Caiyun surname: Wu fullname: Wu, Caiyun organization: University of Pennsylvania – sequence: 6 givenname: Rachel surname: Kogan fullname: Kogan, Rachel organization: University of Pennsylvania – sequence: 7 givenname: Mostafa surname: Al‐Noury fullname: Al‐Noury, Mostafa organization: University of Pennsylvania – sequence: 8 givenname: Mahdie surname: Hosseini fullname: Hosseini, Mahdie organization: University of Pennsylvania – sequence: 9 givenname: Leihui surname: Tong fullname: Tong, Leihui organization: Boston University – sequence: 10 givenname: Samarth surname: Mannikeri fullname: Mannikeri, Samarth organization: University of Pennsylvania – sequence: 11 givenname: Dewey surname: Odhner fullname: Odhner, Dewey organization: University of Pennsylvania – sequence: 12 givenname: Joseph M. surname: Mcdonough fullname: Mcdonough, Joseph M. organization: Children's Hospital of Philadelphia – sequence: 13 givenname: Carina surname: Lott fullname: Lott, Carina organization: Children's Hospital of Philadelphia – sequence: 14 givenname: Abigail surname: Clark fullname: Clark, Abigail organization: Children's Hospital of Philadelphia – sequence: 15 givenname: Patrick J. surname: Cahill fullname: Cahill, Patrick J. organization: Children's Hospital of Philadelphia – sequence: 16 givenname: Jason B. surname: Anari fullname: Anari, Jason B. organization: Children's Hospital of Philadelphia – sequence: 17 givenname: Drew A. surname: Torigian fullname: Torigian, Drew A. organization: University of Pennsylvania |
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| Keywords | thoracic insufficiency syndrome image segmentation early onset scoliosis deep neural networks adolescent idiopathic scoliosis dynamic MRI thoraco‐abdominal organs |
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| SubjectTerms | Abdomen - diagnostic imaging Adolescent adolescent idiopathic scoliosis Automation Child Child, Preschool deep neural networks dynamic MRI early onset scoliosis Humans Image Processing, Computer-Assisted - methods image segmentation Magnetic Resonance Imaging thoracic insufficiency syndrome thoraco‐abdominal organs Thorax - diagnostic imaging |
| Title | Auto‐segmentation of thoraco‐abdominal organs in pediatric dynamic MRI |
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