Automatic validation of the gantry tilt in a computed tomography scanner using a head polymethyl methacrylate phantom

Author:

Noviliawati Rakhma1,Anam Choirul1,Sutanto Heri1,Dougherty Geoff2,Mak’ruf Muhammad Ridha3

Affiliation:

1. Department of Physics, Faculty of Sciences and Mathematics , Diponegoro University , Jl.Prof. Soedarto SH, Tembalang, Semarang 50275, Central Java , Indonesia

2. Department of Applied Physics and Medical Imaging , California State University Channel Islands , Camarillo, CA 93012, USA

3. Department of Electromedical Engineering , Poltekkes Kemenkes, Surabaya, East Java , Indonesia

Abstract

Abstract The purpose of this study was to develop an automatic method for validating the computed tomography gantry tilt. A head polymethyl methacrylate phantom with a diameter of 16 cm was used. Gantry tilt angles were measured both manually and automatically. Manual measurements were performed by measuring the length of the anteroposterior and lateral diameters from acquired images using electronic calipers. Automatic measurements consisted of a number of steps: phantom segmentation, determination of the center of the phantom, measurement of the anteroposterior and lateral diameters, and computation of the gantry tilt angle. The method was implemented on the gantry angles from 0° to 15°. The proposed method of measuring gantry angles produced accurate gantry tilt angles. The differences with the angles displayed on the gantry were less than 1°. The results of the automatic method were the same as those of the manual method (R2 > 0.98).

Publisher

Walter de Gruyter GmbH

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