Introduction: Geometric distortion, an important parameter in neurology and oncology. The current study aimed to design and construct a new three-dimensional (3D) phantom using a 3D printer in order to measure geometric distortion and its 3D reproducibility. Material and Methods: In this study, a new phantom ...

One of the most important specifications of an industrial X-ray computed-tomography (CT) setup used for inspection is the 3-dimensional (3D) resolution that can be achieved in the volumetric image. Sometimes CT setups are evaluated in this regard using a 2D object such as the JIMA micro resolution chart; however, this approach measures the 2D resolution in a projection image and characterizes t...

The aim of our work was to provide a robust method for evaluating imaging performance of positron emission tomography (PET) systems and particularly to estimate the modulation transfer function (MTF) using the line spread function (LSF) method. A novel plane source was prepared using thin layer chromatography (TLC) of a fluorine-18-fluorodeoxyglucose ((18)F-FDG) solution. The source was placed ...

  Introduction: Geometric distortion is a major shortcoming of magnetic resonance imaging (MRI), which has an important influence on the accuracy of volumetric measurements, an important parameter in neurology and oncology. Our goal is to design and construct a new three- dimensional phantom using a 3D printer in order to measure geometric distortion and its reproducibility in...

Mode Cinefluorographic Acquisition adalah mode pencitraan pada pesawat fluoroskopi C-Arm yang menggunakan tegangan tinggi. Penggunaan tinggi ini memberikan peningkatan dosis pasien sehingga perlu diperhatikan besar dan filter digunakan. Penelitian bertujuan untuk mengetahui pengaruh penambahan Al + Cu terhadap arus waktu keluaran phantom PMMA ( Polymethyl methacrylate ) dengan ketebalan 14 cm 2...

Introduction: One of the most valuable goals of phantoms, replacing with human goals in the field of research and quality control of diagnostic X-ray systems. There are various algorithms and methods for obtaining Homogeneity and CT number linearity for CT scan device. One of the most famous of these methods, the method is to use a uniform and homogeneous environment to comput...

ESTRO 35 2016 _____________________________________________________________________________________________________ cm amplitude. A Fourier Transform (FT) was used to calculate the MTF of the images for the static and moving phantom. The MTF of five commonly used LOG filters were calculated. The response of the filters was compared with the MTF of the images to determine if the motion would aff...

When patient anatomy is positioned away from a CT scanner's isocenter, scans of limited diagnostic value may result. Yet in some cases, positioning of patient anatomy far from isocenter is unavoidable. This study examines the effect of posi-tion and reconstruction algorithm on image resolution achieved by a CT scanner operating in a high resolution (HR) scan mode which incorporates focal spot d...

conclusion we constructed and validated a ct colonography phantom with correct density allowing performance of reproducible experiments. materials and methods we found 15 different phantom designs by literature search and compared their advantages and disadvantages based on their description and images. we tested various materials for density and mechanical properties and constructed a phantom ...

Introduction: In recent years, the use of magnetic resonance (MR) images in radiation treatment planning has drawn considerable attention. However, although the extent of a tumor can be determined in great detail on MR images, the geometric accuracy of these images is limited by distortions stemming from the inhomogeneity of the static background magnetic field, the nonlineari...