نتایج جستجو برای: digital imaging
تعداد نتایج: 748288 فیلتر نتایج به سال:
OBJECTIVES To assess the performance of digital imaging, compared with other modalities, in screening for and monitoring the development of diabetic retinopathy. DESIGN All imaging was acquired at a hospital assessment clinic. Subsequently, study optometrists examined the patients in their own premises. A subset of patients also had fluorescein angiography performed every 6 months. SETTING ...
Introduction: The use of digital radiography systems has become more common all around the world. Ideal situation in radiography is to maximize the image quality while minimizing the patient dose. The purpose of this study was to compare image quality and radiation dose in different digital radiography systems. Materials and Methods: Images of Pehamed FLUORAD ...
8 The advantages of digital radiography (DR) over screen-fi lm (SF) techniques in medical X-ray imaging are well documented in the literature and unanimously acknowledged by radiologists as well as physicists. For the past decade manufacturers have developed a number of commercial digital X-ray imaging systems covering the full range of radiographic applications. The tight requirements in terms...
Advanced Functional Tumor Imaging and Precision Nuclear Medicine Enabled by Digital PET Technologies
The purpose of this article is to provide a brief overview of the background, basic principles, technological evolution, clinical capabilities, and future directions for functional tumor imaging as PET evolves from the conventional photomultiplier tube-based platform into a fully digital detector acquisition platform. The recent introduction of solid-state digital photon counting PET detector i...
Recent developments in digital holography techniques are presented. The Fourier transform and convolution methods to calculate the diffraction fields are compared with the angular spectrum method, which allows short reconstruction distances down to zero with flexibility in the control of image noise. Examples of applications of digital holography in biological microscopy are presented with subm...
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