The effect of added fat on the accuracy of Cobb angle measurements in CT SPR images : a phantom study

Alrehily, F, Alanezi, A, Alsady, G, Benqlilou, M, Carlos, L, Smit, C, Snetler, L and Coward, J 2020, 'The effect of added fat on the accuracy of Cobb angle measurements in CT SPR images : a phantom study' , Radiography, 26 (Supp 2) , S88-S93.

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Abstract

Introduction Adolescent idiopathic scoliosis (AIS) is a spinal deformity that mostly affects females aged between 10 and 17 years old. Cobb's method is the gold standard for assessing AIS. Being overweight is a common characteristic in AIS patients; therefore, the aim of this study is to investigate the effect fat mass has on the accuracy of Cobb angle measurements in 10-year-old female AIS patients.
Methods A purpose-built phantom representing an AIS patient was scanned after adding several thicknesses of lard fat (0,2,4 and 8 cm). The phantom was scanned in an antero-posterior position using the scout mode of the CT scanner. 18 observers performed Cobb angle measurements on the images.
Results The average Cobb angle at 0 cm of fat was 10.83° (SD = 3.06), at 2 cm it was 10.90° (SD = 3.16), at 4 cm it was 10.64° (SD = 3.06) and at 8 cm it was 10.88° (SD = 3.02). No significant difference was observed between the measurements at these thicknesses.
Conclusion Cobb angle measurements are not affected by the presence of fat.
Implications for practice When assessing overweight AIS patients, it not necessary to manipulate the acquisition parameters, which could lead to increased patient dose, in order to get more accurate Cobb angle measurement.

Item Type: Article
Additional Information: ** Article version: AM ** Embargo end date: 31-12-9999 ** From Elsevier via Jisc Publications Router ** Licence for AM version of this article: This article is under embargo with an end date yet to be finalised. **Journal IDs: issn 10788174 **History: issue date 24-04-2020; accepted 06-04-2020
Schools: Schools > School of Health and Society
Journal or Publication Title: Radiography
Publisher: Elsevier
ISSN: 1078-8174
Related URLs:
SWORD Depositor: Publications Router
Depositing User: Publications Router
Date Deposited: 07 Jul 2020 10:57
Last Modified: 01 Sep 2020 12:42
URI: http://usir.salford.ac.uk/id/eprint/56925

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