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Will Creene
เข้าร่วมเมื่อ 11 มิ.ย. 2020
Educational videos on Diagnostic Imaging.
CT Protocols
0:00 Intro
0:08 CT Requisition Grading Process
0:48 What's In A Protocol
1:12 Sample CT Head Protocol
1:32 Patient Preparation
2:04 Scan Instructions, Positioning
2:33 Z-axis coverage
2:41 Injection Parameters
4:01 Technical Parameters
4:34 Dose and Image Quality
6:28 Detector Configuration
6:51 Reconstructions, Rendering and Image Processing
8:03 Additional Comments
8:15 Protocol Development
Script and Audio-Only: drive.google.com/drive/folders/1HV19j4sgHiFpBZF8at1uRBtr4soHevvx?usp=sharing
0:08 CT Requisition Grading Process
0:48 What's In A Protocol
1:12 Sample CT Head Protocol
1:32 Patient Preparation
2:04 Scan Instructions, Positioning
2:33 Z-axis coverage
2:41 Injection Parameters
4:01 Technical Parameters
4:34 Dose and Image Quality
6:28 Detector Configuration
6:51 Reconstructions, Rendering and Image Processing
8:03 Additional Comments
8:15 Protocol Development
Script and Audio-Only: drive.google.com/drive/folders/1HV19j4sgHiFpBZF8at1uRBtr4soHevvx?usp=sharing
มุมมอง: 7 594
วีดีโอ
CT Advanced and Emerging Applications
มุมมอง 3.2K3 ปีที่แล้ว
0:00 Intro 0:08 CT Angiography (CTA) 0:27 Bolus Monitoring / Triggered Studies 1:50 Cardiac CT, ECG Gating 2:08 Prospective Gating 2:35 Retrospective Gating 3:07 Calcium Scoring 3:34 Virtual Endoscopy (Colonoscopy, Bronchoscopy, Angioscopy) 4:11 Dual Energy CT (DECT) 5:58 CT Simulation (Radiation Therapy Planning) 7:00 CT-Guided Interventional Radiology Procedures 7:33 Cone Beam CT (CBCT) 7:54 ...
CT Quality Control
มุมมอง 13K3 ปีที่แล้ว
0:00 Intro 0:19 QC Role of All Technologists (Warm-up, Air Calibrations) 1:05 QC Tests 1:26 Water Phantom 1:36 CT Number Accuracy 1:53 Cross-Field Uniformity 2:38 Noise 3:12 CT Number Linearity 3:56 CT Slice Thickness (CT Tomographic Section Thickness) 4:28 Spatial Resolution 4:51 Modulation Transfer Function 5:06 Contrast Resolution (CT Low Contrast Detectability) 5:53 Patient Dose 6:40 Image ...
CT Dose
มุมมอง 13K3 ปีที่แล้ว
0:00 Intro 0:07 Absorbed Dose 0:13 Equivalent Dose 0:27 Effective Dose 0:41 CT Dose Index (CTDI) 2:04 Dose-Length Product (DLP) 2:22 Dose and Image Quality 3:50 Technical Factors and Dose 4:15 Automatic mA modulation 5:22 In-Field Bismuth Shielding 6:15 Filtration, Bowtie Filters 7:00 Out-of-Field Lead Shielding Script and Audio-Only: drive.google.com/drive/folders/1HV19j4sgHiFpBZF8at1uRBtr4soH...
CT Image Reconstruction
มุมมอง 55K3 ปีที่แล้ว
0:00 Intro 0:17 Back Projection 1:20 Filtered Back Projection 1:34 Filters 1:49 Sharpening Filter 2:30 Smoothing Filter 3:05 Sharp vs Smooth 4:27 Iterative Reconstruction 5:52 Multi Planar Reformatting (MPR) 7:06 Rendering Modes: Averaging, MIP, MinIP 8:45 3D Volume and Surface Rendering Script and Audio-Only: drive.google.com/drive/folders/1HV19j4sgHiFpBZF8at1uRBtr4soHevvx?usp=sharing
CT Contrast Media
มุมมอง 21K3 ปีที่แล้ว
0:00 Intro 0:14 Iodinated Contrast Media 0:30 Routes of Administration 1:04 Oral Contrast 1:24 Intravenous (IV) Contrast 1:54 Central Venous Access Devices (CVADs) 2:07 Risk Factors and Consent 3:10 Scan Delay and Phases 3:57 Power Injection 4:41 Normal Side-Effects 5:04 Adverse Reactions 6:09 Kidney Function, Contrast-Induced Nephropathy 6:50 Estimated Glomerular Filtration Rate (eGFR) 7:14 Ex...
CT Image Quality
มุมมอง 12K3 ปีที่แล้ว
0:00 Noise 0:30 Signal-to-Noise Ratio 0:54 Resolution 1:03 Spatial Resolution (High-Contrast Resolution) 1:31 Contrast Resolution (Low-Contrast Resolution) 1:56 Temporal Resolution 2:31 Improving Spatial Resolution 4:24 Improving Contrast Resolution 5:35 Summary on Image Quality and Dose Script and Audio-Only: drive.google.com/drive/folders/1HV19j4sgHiFpBZF8at1uRBtr4soHevvx?usp=sharing
CT Housfield Units and Windowing
มุมมอง 14K3 ปีที่แล้ว
0:10 Image Production, Reconstruction 0:33 Linear Attenuation Coefficient 1:45 Back Projection 2:02 CT Numbers, Hounsfield Units 2:49 Calculating CT Numbers 3:37 Windowing 4:08 Window Width 6:09 Window Level 6:54 Combining Window Width and Window Level Script and Audio-Only: drive.google.com/drive/folders/1HV19j4sgHiFpBZF8at1uRBtr4soHevvx?usp=sharing
CT Pitch and Field of View
มุมมอง 24K3 ปีที่แล้ว
0:03 Helical Pitch 1:17 Low Pitch 1:35 High Pitch 2:00 Low Pitch (Oversampling) 2:41 High Pitch (Undersampling) 3:40 Field of View 3:49 Scan Field of View (SFOV) 4:29 Display Field of View (DFOV) 5:33 Field of View Summary Script and Audio-Only: drive.google.com/drive/folders/1HV19j4sgHiFpBZF8at1uRBtr4soHevvx?usp=sharing
CT Basics: Major Components
มุมมอง 26K4 ปีที่แล้ว
0:06 Comparison: CT to conventional radiography; pixels vs voxels. 0:52 1st and 2nd generation CT scanners 1:24 3rd generation (modern) scanners 1:47 Multi-row detectors 2:11 External components: Generator, Gantry, Table, Z-axis, console. 3:03 Internal Components: Tube, Detector, Data acquisition system 3:18 Slip Ring Technology 3:53 Helical and Axial Scan modes 4:47 Internal Components: Beam O...
thanks!! at last ! one video explanation on youtube we can understand and we do not need explanation for the explanation
Great video and Explanation ! ( CT Service Technician here ). Trying to improve my theory !
Wow CT tech is wild
Please make some vedios on mri also🙏
Thank You!!!!
Nice 👍
th-cam.com/video/o2uDn-lAB4I/w-d-xo.htmlsi=lbAnn6N23ZiKKe93
I have been watching many of your videos and I just want to say thank you for helping me study for my CT boards
Took me looking at about 20 CT scanning videos to see this exact explanation. Incredibly helpful! (Oh and terminology i can use eg filtered backprojection and iterative reconstruction to find more stuff!!!)
th-cam.com/video/i2dHp0GNEAA/w-d-xo.htmlsi=3q74uKWMK6FK1cTO
Thank you so much you just explained the 4h slides I had to learn in 7 minutes
Hello Will- would you do some private review?? 😅
Hello Will - would you be available for some tutoring or review?
Great and straight explanation. Thanks Will
Thank you for your effort :) It meant a lot for me just before my advanced imaging exam :)
U should go step by step with bone and lung... especially when writing out number line
As a radiologist in the making this helped me tonnes! Thankyou so much!!!
amazing!
Very informative , thanks for sharing
do the ct boards make you do math questions about this type of thing or is it more general familiarity?
Thats just not true in 80 and more % of the cades that increasing the pitch is decreasing the dose ore the other way. Show me a scaner where this is the case in dose modulated scans (there is no one). Thats only true with scaners during not dose modulated scans with GE and Canon. Because there are working with ma and not mas like siemens or Philips.
Simple & easy to understand. Thank you!
Thank u sir. U are a life saver. U made the concept easier to understand.
Nice job .and thank you
As before, clear, complete and simple. What is not easy.... Thank´s for your job.!
Clear and great explanation. Thank´s for your job !
Very informative Thank you sir
Very informative Thank you sir
nice explanation sir...
i feel like im watching blues clues again. thank you this is amazing. 😭
amazing video thank you! For those studying with MOSBY pg 91 and a practice question say the generator is now house IN the gantry.
omg this saved me THANK YOU!!
Very well explained !!
Very well explained !!
Great video. Who assigns the the WW and L? Is it the same for all vendors/machines?
Wonderful explanation
Thank you very much. Very informative.
Thanks for the explanations, keep up the good work. One clarification is that at pitch greater than 1 there is typically not a gap and the data is not undersampled. There is less than a full scan of data but reconstruction can still be very accurate in this scenario. I know some books show this as a gap but this is a misnomer. Above pitch 1.37 or so is where data starts to be missing depending on DFOV.
Thank you so much :)
Thank You So Much
Very helpful thank you!
Thank you! your explanation is perfect !
This video is amazing at explaining the scanner. Thank you so much!
Very nice explanation
Thank you
Can I please clarify - increasing pitch will increase noise? Therefore increasing pitch will decrease signal noise ratio, leading to poorer contrast resolution
Hi Diana, thanks for the question. Signal to noise ratio is essentially a function of how much information you are collecting. Anything that decreases your radiation dose from the source is going to decrease the total amount of radiation hitting the detector, and decrease our overall signal. Less signal means more noise. Regarding pitch - if the pitch is higher, that means the patient is moving through the scanner faster relative to the speed of gantry rotation. There is less exposure time per volume of body tissue, and for pitch >1, there "gaps" in between helical rotation in which information is not acquired from all sides at all levels in the Z-axis. All of this combines to mean less radiation dose to the patient, less radiation to the detector, less signal, and thus lower signal to noise ratio (= more noise!) Hope this makes sense :)
Thanku sir for this session
Play back speed is too fast 🤷♂️
Hello sir what are your sources?
Thanks!