You can only use OsiriX Lite as a reviewing and scientific software, not for primary diagnostic. This version of OsiriX is NOT certified as a medical device for primary diagnosis. OsiriX is able to receive images transferred by DICOM communication protocol from any PACS or medical imaging modality (STORE SCP - Service Class Provider, STORE SCU - Service Class User, and Query/Retrieve). It is fully compliant with the DICOM standard for image communication and image file formats. It can also read many other file formats: TIFF (8,16, 32 bits), JPEG, PDF, AVI, MPEG and Quicktime. ) and confocal microscopy (LSM and BioRAD-PIC format). A quantitative theory of the Hounsfield unit and its application to dual energy scanning.Ī standard definition is proposed for the Hounsfield number.OsiriX is an image processing software dedicated to DICOM images (.dcm /.DCM extension) produced by medical equipment (MRI, CT, PET, PET-CT. The energy dependence of the Hounsfield number, H, is given by the expression H = (Hc + Hp Q)/(1 + Q), where Hc and Hp are the Compton and photoelectric coefficients of the material being measured, expressed in Hounsfield units, and Q is the "quality factor" of the scanner.Īny number in computed tomography can be converted to the Hounsfield scale after performing a simple calibration using air and water. Q can be measured by performing a scan of a single calibrating material, such as a potassium iodine solution. By applying this analysis to dual energy scans, the Compton and photoelectric coefficients of an unknown substance may easily be obtained. This can lead to a limited degree of chemical identification. Hounsfield units are a useful predictor of pleural effusion cytological type in dogs but not in cats. Woods, Sarah J Spriet, Mathieu Safra, Noa Cissell, Derek D Borjesson, Dori LĪll categories of pleural effusion subjectively display as soft tissue opacity on computed tomography (CT). Quantitative measurement using Hounsfield units (HU) has the potential to bring additional information regarding the nature of the fluid in a noninvasive way. The purposes of this retrospective cross-sectional analytical study were to compare Hounsfield units of different pleural effusion categories in dogs and cats, assess association between specific cytologic parameters and Hounsfield units, and evaluate the effect of dependent vs. nondependent aspect of the effusion pool on Hounsfield unit. DCM extension) produced by medical equipment (MRI, CT, PET, PET-CT. A total of 111 patients (74 dogs and 37 cats) with pleural effusion, that underwent thoracic CT and diagnostic thoracocentesis, were included in the study. OsiriX Lite is an image processing software dedicated to DICOM images (.dcm /. OsiriX has been specifically designed for image fusion, cardiac CT, multi-series MRI exams and 3D reconstructions. OsiriX is able to receive DICOM images (STORE SCP - Service Class Provider) from a PACS network. It is compatible with DICOM files and PACS networks. Effusions were cytologically categorized as exudate, transudate, modified transudate, hemorrhage, or chyle. OsiriX Lite is an advanced DICOM viewer application for MacOS X. Willner, Marian Fior, Gabriel Marschner, Mathias Phase-contrast Hounsfield units of fixated and non-fixated soft-tissue samples Significant differences existed in Hounsfield units between categories in dogs (P 14 HU had a specificity of 100% and a sensitivity of 69% for identifying exudate, modified transudate, or hemorrhage. X-ray phase-contrast imaging is a novel technology that achieves high soft-tissue contrast. In conventional attenuation-based X-ray computed tomography, radiological diagnostics are quantified by Hounsfield units.Īlthough its clinical impact is still under investigation, the technique may potentially improve clinical diagnostics. Corresponding Hounsfield units for phase-contrast imaging have been recently introduced, enabling a setup-independent comparison and standardized interpretation of imaging results. Thus far, the experimental values of few tissue types have been reported these values have been determined from fixated tissue samples. This study presents phase-contrast Hounsfield units for various types of non-fixated human soft tissues. A large variety of tissuemore » specimens ranging from adipose, muscle and connective tissues to liver, kidney and pancreas tissues were imaged by a grating interferometer with a rotating-anode X-ray tube and a photon-counting detector.
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