Assessment of double hole contrast detail phantom for image displacement evaluation

Pauzi, Nur Farahana and Abdul Majid, Zafri Azran and Sapuan, Abdul HaliM and Che Azemin, Mohd Zulfaezal and Junet, Laila Kalidah (2014) Assessment of double hole contrast detail phantom for image displacement evaluation. Applied Mechanics and Materials, 661. pp. 168-175. ISSN 1660-9336

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Abstract

Contrast Detail phantom is used to evaluate the Contrast Detail performance of imaging system. The wall of drilled hole in commercial Contrast Detail phantom will give effect to the penetration of x-ray beam divergence to pass through the base of each hole. This effect will lead to false appearance of image but it does not visualised in the radiograph. In this study, a new design of Contrast Detail phantom’s hole has been developed. The hole feature differs from the current Contrast Detail phantom. The hole consists of combination of different hole's diameters, whereby the small hole diameter (3 mm) is placed on top of large hole diameter of different measurements (5 mm, 7 mm and 10 mm). The thickness of double hole acrylic blocks vary from 10 mm, 15 mm, 20 mm, 25 mm and 30 mm. A tiny size of iron which is used as an indicator was placed at the bottom of each holes. Results shows that, as the value of Source Image Distance (SID) values decrease from 2000 mm, 1800 mm, 1600 mm, 1400 mm, 1200 mm, 1000 mm to 800 mm, the size of upper hole image in different thickness of acrylic block increases from the original size (3mm). In different SID setting, variable acrylic block heights (10 mm, 15 mm, 20 mm, 25 mm and 30 mm) which are located at 100 mm from the center show that, the heighest acrylic block visualises the greatest image displacement. Image displacement which occurs due to magnification can be compensated by increasing the level of SID value and also by reducing the height of acrylic block. The increment in image displacement occurs when the hole is situated far from the center of x-ray beam. The new design of hole shows the effect of displacement of object from the x-ray focal length in a well manner.

Item Type:	Article (Journal)
Additional Information:	4556/43454
Uncontrolled Keywords:	Contrast detail phantom, double hole design, image displacement
Subjects:	Q Science > QC Physics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Allied Health Sciences > Department of Diagnostic Imaging and Radiotherapy Kulliyyah of Allied Health Sciences
Depositing User:	Mr Abdul Halim Sapuan
Date Deposited:	22 Jun 2015 14:15
Last Modified:	30 Jun 2022 15:55
URI:	http://irep.iium.edu.my/id/eprint/43454

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