Dogs chest homogeneous phantom for image optimization. (September 2016)

• Record Type: Journal Article
• Authors: Rosa, Maria E.D.; de Oliveira, Marcela; Pavan, Ana L.M.; Alves, Allan F.F.; Vulcano, Luis C.; Pina, Diana R.
• Is Part Of: Physica medica. Volume 32(2016)Supplement 3
• Page Start: 337
• Publication Date: 2016-09
• Subjects: Medical physics -- Periodicals; Biophysics -- Periodicals; Biophysics -- Periodicals; Imagerie médicale -- Périodiques; Radiothérapie -- Périodiques; Rayons X -- Sécurité -- Mesures -- Périodiques; Physique -- Périodiques; Médecine -- Périodiques; 610.153
• DOI: 10.1016/j.ejmp.2016.07.256
• Languages: English
• ISSNs: 1120-1797

Abstract

Abstract : Introduction: There has been an increasing substitution of image acquisition screen-film systems for computed radiology (CR) equipment without technical charts adequacy. To carry out a radiographic examination in veterinary patient is required human assistance for restraint this, which can compromise image quality by generating dose increasing to the animal and for Occupationally Exposed. The image optimization procedures are performed with the use of homogeneous phantoms. Purpose: We propose the development of a homogeneous phantom of canine chest to be applied to optimization of images for the CR system. Materials and methods: A database with retrospectives chest images of computed tomography (CT) was created. The thickness of biological tissues was quantified in 80 animals, separated in groups of 20 animals according to their weights: Small, Medium, Large and Giant. An algorithm was developed to classify and quantify biological tissues present images and convert them in simulator materials. To classify tissues presents, membership functions were created from the retrospective CT scans according to the type of tissue (adipose, muscle, bone trabecular or cortical and lung tissue). Results: Biologic tissue thickness was converted in equivalent material thicknesses (acrylic simulating soft tissues, aluminum simulating bones and air to the lung). Four different homogeneous phantoms were obtained, Small with 5 cm of acrylic, 0, 14 cm of aluminum and 1, 8 cm of air; medium with 8, 7 cm of acrylic, 0, 2 cm of aluminum and 2, 4 cm of air; large with 10, 6 cm of acrylic, 0, 27 cm of aluminum and 3, 1 cm of air and giant with 14, 8 cm of acrylic, 0, 33 cm of aluminum and 3, 8 cm of air. Conclusion: The canine homogeneous phantom is a practical tool, which will be employed to optimize veterinary X-ray procedures. Disclosure: The authors declare that there are no interest conflicts.