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HRCT PowerPoint Presentation

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Description : HRCT is performed using a conventional CT scanner. However, imaging parameters are chosen so as to maximize spatial resolution

Tags : ct HRCT

Published on : Dec 07, 2020 | Views : 1987 | Downloads : 0

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دانسیته نرمال ریه ها ناشی از تناسب هوا به بافت نرم (خون یا پارانشیم) با یک نسبت 11به 1 است
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کدورت های ریوی غیر طبیعی کدورت های پر کننده فضای هوایی(air space filling opacities) کدورت های بینا بینی(interestitial opacities) کدورت های ناشی از اتلکتازی(atelectasis opacities) کدورت های ندولار یا شبه توده(mass like opacities) کدورت های شاخه شاخه شونده(branching opacities)
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لوسنسی های غیر طبیعی ریوی ضایعات رادیولوسنت فوکال کاویته کیست بول Bleb پنوماتوسل
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UTILITY OF THIN-SECTION CT IN THE EVALUATION OF CHRONIC INTERSTITIAL LUNG DISEASE 1-Detection of clinically suspected parenchymal abnormality when the chest radiograph is normal or shows questionable abnormality 2-Characterization of parenchymal abnormalities 3-Biopsy planning:Determination of route for biopsy, i.e., transbronchial, open lung, or bronchoalveolar lavage Targeting biopsy to area(s) of active disease and avoiding areas of end-stage ﬁbrosis 4-Monitoring of response to therapy or progression of disease
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RESOLUTION SPATIAL RESOLUTION CONTRAST RESOLUTION
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HRCT is performed using a conventional CT scanner. However, imaging parameters are chosen so as to maximize spatial resolution: A narrow slice width is used (usually 1–2 mm) A high spatial resolution image reconstruction algorithm is used Field of view is minimized, so as to minimize the size of each pixel Noise…mA Depending on the suspected diagnosis, the scan may be performed in both inspiration and expiration. The patient may also lie prone (face down) rather than the more usual supine (face up)
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As HRCT's aim is to assess a generalized lung disease, the test is conventionally performed by taking thin sections 10–40 mm apart. The result is a few images that should be representative of the lungs in general, but that cover only approximately one tenth or 1/8 of the lungs.(slice thickness & interval) Because HRCT does not image the whole lungs (by using widely spaced thin sections), it is unsuitable for the assessment of lung cancer or other localised lung diseases. Intravenous contrast agents are not used for HRCT as the lung inherently has very high contrast (soft tissue against air), and the technique itself is unsuitable for assessment of the soft tissues and blood vessels, which are the major targets of contrast agents.
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Example scan technique(prone) Patient lies prone 1 mm thick images are taken at 10 mm spacings from lung apices to lung bases, the patient breathes in fully for each image Good for AT in disabled persones
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