CT Machine: X-ray Tube, Detector, Filter, Collimator, Slip Ring. Computed Tomography Physics #2

Pass your radiology physics exam first time. Complete radiology physics past paper question bank 👇 https://learnradiologyphysics.com/ ========================= I have also created two RADIOPAEDIA LEARNING PATHWAYS https://bit.ly/radiopaediaphysics (👈 25% OFF DISCOUNT LINK) WHAT’S INCLUDED? ✅This YouTube series Ad free ✅Constantly updated Radiopaedia articles ✅Summary slides ✅Key take home bullet points throughout ✅Multiple review quizzes ✅Short answer review questions ✅Official Radiopaedia course completion certificate ✅AMA PRA Category 1 Credits ™️ 25% discount using this link: https://bit.ly/radiopaediaphysics ========================= 00:00 - Introduction 00:58 - Cathode 01:24 - Thermionic emission 02:10 - Anode 02:40 - Tube current 03:29 - Focal spot 04:46 - Anode heat tolerance 05:48 - Line focus principle 07:21 - X-ray production 09:02 - Bremsstrahlung radiation 13:20 - Characteristic radiation 16:10 - X-ray spectrum 17:35 - Detectors 20:32 - Beam geometry 21:49 - Collimation 23:15 - Anti-scatter grid 26:38 - Filtration 28:46 - Beam shaping filters 32:12 - Slip ring 34:30 - Housing Today we'll discuss the CT Machine. We'll start by looking at X-ray production. We'll review the process of thermionic emission at the cathode filament. Next we'll discuss how filament current and tube potential influence X-ray beam quantity and quality. X-rays are produced at the actual focal spot and the line focus principle determines the size of the effective focal spot (using the anode andgle and actual focal spot product). Most of the bombarding electrons at the anode produce heat. The remainder will cause the release of x-ray radiation. This is either Bremsstrahlung radiation or characteristic radiation. We review both here. Once x-rays have been produced they need to be detected in order to start image processing. X-rays are detected by either direct or indirect detector elements. The majority of modern scanners use indirect detectors (solid state detectors) which convert x-rays into light and light into electrical current. Following this we'll review anti-scatter grids in computed tomography (CT), as well as collimation and filtration of the x-ray beam. We'll end things off by looking at how slip ring technology allows for continual rotation of the CT machine. ========================= Not sure if the question banks are for you? If you're here, you're likely studying for a radiology physics exam. I've spent the last few months collating past papers from multiple different countries selecting the most commonly asked questions. You'll be surprised how often questions repeat themselves! The types of questions asked in FRCR, RANZCR AIT, ARRT, FC Rad Diag (SA), ABR qualifying Core Physics and MICR part 1 are surprisingly similar and the key concepts remain the same throughout. I've taken the most high-yield questions and answered them in video format so that I can take you through why certain answers are correct and others are not. Happy studying, Michael #radiology #radres #FOAMrad #FOAMed