A1 Journal article (refereed)
Estimation of thyroid volume from scintigraphy through 2D/3D registration of a statistical shape model (2019)

Wang, H., Yu, D., Tan, Z., Hu, R., Zhang, B., & Yu, J. (2019). Estimation of thyroid volume from scintigraphy through 2D/3D registration of a statistical shape model. Physics in Medicine and Biology, 64(9), Article 095015. https://doi.org/10.1088/1361-6560/ab186d

JYU authors or editors

Publication details

All authors or editors: Wang, Hongkai; Yu, Dongyu; Tan, Ziyu; Hu, Ruxue; Zhang, Bin; Yu, Jing

Journal or series: Physics in Medicine and Biology

ISSN: 0031-9155

eISSN: 1361-6560

Publication year: 2019

Volume: 64

Issue number: 9

Article number: 095015

Publisher: Institute of Physics

Publication country: United Kingdom

Publication language: English

DOI: https://doi.org/10.1088/1361-6560/ab186d

Publication open access: Not open

Publication channel open access: 

Abstract

Accurate measurement of thyroid volume is important for thyroid disease diagnosis and therapy. In nuclear medicine, the thyroid volume is usually estimated from scintigraphy images using empirical equations. However, due to the lack of volumetric information from the scintigraphy image, the accuracy of equation-based estimation is imperfect. To solve this problem, this paper proposes a method which registers a 3D thyroid statistical shape model (SSM) to a single-view scintigraphy image to achieve more accurate volume estimation. The SSM was constructed based on a training set of segmented 3D CT images, and the thyroid shape variations between the training subjects were modelled using the point distribution model. For thyroid volume estimation, the SSM was projected into the scintigraphy image of the target patient, and then the projected model shape was nonrigidly registered with the patient's scintigraphy image. The resultant 2D deformation file was back-projected to 3D space to guide the deformation of the 3D SSM. This process was repeated iteratively until convergence, and the volume of the finally deformed SSM was considered as the estimation of the patient's thyroid volume. For validation, this method was evaluated based on a test set of 20 scintigraphy images, achieving an estimation error of  −2.10%  ±  5.20% which was much less than the error of the conventional equation-based method (35.76%  ±  15.20%) based on the same test set. The robustness of this method was further tested using a challenging case, i.e. a scintigraphy image with a large thyroid tumor. For this case, the volume estimation error was only 6.08%. Our method has significantly improved the accuracy of thyroid volume estimation from scintigraphy images, and it will enhance the value of scintigraphy imaging for thyroid disease diagnosis and radioiodine therapy.

Keywords: imaging; modelling (representation); gammaradiography; thyroid gland

Contributing organizations

Ministry reporting: Yes

Reporting Year: 2019

JUFO rating: 2