Polymethyl Methacrylate (Perspex) Line Pattern Phantom : A New Gamma Camera Test Pattern for Assessment of Extrinsic Resolution and Linearity

Journal Title: Sultan Qaboos University Medical Journal - Year 2001, Vol 3, Issue 1

Abstract

Objective: To evaluate the newly designed polymethyl methacrylate (Perspex) line pattern phantom (PLPP) for testing extrinsic resolution and linearity of gamma camera. Method: The phantom was made of 10 mm thick Perspex in which tubes of 1 mm external diameter and 0.5 mm internal diameter were inserted in 1 mm deep grooves, which had been machined in a particular pattern. The final arrangement of lines divided the phantom into four similar quadrants, which encompassed the whole surface of the gamma camera head. Such an arrangement permitted full detection of any change in the linearity and resolution. The tube was filled with technetium-99m (99mTc). Tests were performed on the only two single-headed gamma cameras available in Oman. Results: It was possible to resolve two lines as close as 6 mm. Using the line spread function (LSF) facility, the estimated full width half maximum height (FWHM) value was 4.1 mm. In addition, any distortion in the shape of the lines, used to measure linearity, could be easily detected over the entire surface of the camera head. Conclusion: Data obtained from the PLPP are in agreement with those obtained using the conventional four-quadrant bar pattern phantom (FQBP). The generally accepted relationship that the line profile FWHM is equal to approximately twice the minimal resolvable bar spacing does not apply to the PLPP. However, PLPP gives multi-direction linearity in any one quadrant. In addition, it does not need a flood source for imaging, thus minimizing the test cost.

Authors and Affiliations

Fadhil M Salih| Department of Clinical and Biomedical Physics, College of Medicine, Sultan Qaboos University, P.0.Box 35, AI-Khod 123, Muscat, Sultanate of Oman, Afkar N Al-Farsi| Department of Clinical and Biomedical Physics, College of Medicine, Sultan Qaboos University, P.0.Box 35, AI-Khod 123, Muscat, Sultanate of Oman

Keywords

Related Articles

Combination of a Giant Dissected Ascending Aortic Aneurysm with Multiple Fistulae into the Cardiac Chambers Caused by Prosthetic Aortic Valve Endocarditis

Te combination of a dissected ascending aortic aneurysm (AA) with multiple fstulae to the periaortic root structures is a life-threatening complication that occurs rarely after infective endocarditis of the prosthetic...

Single-Incision Multi-Port Appendectomy for a Patient with Situs Inversus Totalis First case report

Situs inversus totalis (SIT) is a rare autosomal recessive condition involving the complete lateral transposition of the organs. When individuals with this condition suffer from appendicitis, associated pain and sympt...

Anaesthesia Management of a Patient with Hereditary Angioedema with Prophylactic Administration of C1 Esterase Inhibitor Case report and literature review

Hereditary angioedema (HAE) is a rare disorder caused by a defciency of C1 esterase inhibitor. Minor trauma and emotional stress are the most common initiating events leading to contact system activation and excessive...

Gestational and Pregestational Diabetes Mellitus in Omani Women Comparison of obstetric and perinatal outcomes

Objectives: Te aim of this study was to assess the prevalence of gestational diabetes mellitus (GDM) and pregestational diabetes mellitus (PGDM) among pregnant women in Oman and compare their obstetric and perinatal ou...

Download PDF file
  • EP ID EP13621
  • DOI -
  • Views 313
  • Downloads 19

How To Cite

Fadhil M Salih, Afkar N Al-Farsi (2001). Polymethyl Methacrylate (Perspex) Line Pattern Phantom : A New Gamma Camera Test Pattern for Assessment of Extrinsic Resolution and Linearity. Sultan Qaboos University Medical Journal, 3(1), 3-7. https://europub.co.uk/articles/-A-13621