Multi-slice CT (What killed single slice CT?)
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- čas přidán 18. 05. 2024
- Multi-slice CT is the state-of-the-art for clinical computed tomography (CT) scanning. There was an evolution from single slice CT to multi-slice which happened over several years.
We reveal several reasons why multi-slice CT has taken over and single slice CT is no longer produced for medical CT. These include:
Chapters:
00:00 Slice wars in CT introduction
00:53. A comparison of single slice vs multi-slice architecture.
02:03 Multi-slice CT enables isotropic resolution in reformat images (sagittal and coronal).
03:04. Multi-slice CT has a higher dose efficiency than single slice CT.
04:28. Multi-slice CT makes better use of the x-ray tube power.
05:20. Multi-slice CT can still produce thick slices.
05:44. Multi-slice CT evolution to volume coverage scanning.
07:07. Methods to increase the z resolution (flying focal spot, conjugate ray backprojection).
09:47. Why CT scanners should not be specified by the number of slices. - Věda a technologie
Your website is great thank you!
Thanks Yara, I appreciate you taking the time to let me know.
I really apperciate your exerted efforts to explain it simply
💓👏🌼
Thanks for the comments Abdo
@@HowRadiologyWorks you’re welcome sir.
Could you talk about rotating envelope tubes in ct scanners and how they differ from conventional x-ray tubes just a idea for a video 😊
Thanks JMS, I’ll put it on the list. I personally haven’t worked with those yet so it may be some time.
Thank you for your explanation. I have one doubt...what determines the slice thickness in single slice CT ..Is it collimator width or detector width.?
I understand that in multidetector it is the detector width..
That’s right for modern scanners the height of each detector is the dominant determinant of z resolution along with the focal spot dimension in z
Thank you for the video. Are you aware of a website that lists medical offices offering the best quality CT Scans?
Sorry The truth I'm aware of a website that offers grading based on quality of CT scans, that is an interesting idea, but the criteria could be hard.
Is slice range matter image quality very much or diagnosis is it related with zoom image
The slice thickness and range of slices contribute to the image quality. I’m not sure what you mean by zoom images?
Is a multiphase ct scan the same as a multislice or multiplanar ct scan
Multi phase CT corresponds to multi time points which are image volumes of different a moving object such as lungs or heart. Multi slice is used for all modern scanners.
@@HowRadiologyWorks thanks for the reply, is multislice and multiplanar the same scan
I am ohh so confused what the difference is between the terms slices, rows, channels, and arrays. I've been reading a lot but am still really struggling to understand these concepts
This is how i currently understand it, i don't know if it is correct or if i'm missing something: Rows are the physical detector elements. Channels are what the operator selects to obtain certain slice thicknesses from a row or combination of rows. Rows, channels, and slices are laid along the z direction, while an arrays are laid along the x-axis.
If you are looking at the detector it is a big array which will measure a 2D signal or projection. The number of rows is the number of elements in the up down direction, the number of columns is in the left right direction. So the total measurements for each view in the detector array = rows*columns . The number of slices is not exactly tied to these and isn’t the best way to specify a scanner. The number of slices is in a separate space we call the image space
@@HowRadiologyWorksI see now. It just really irks me that Bushberg doesn't once mention the word "row" in the entire CT chapter. I'm thinking he replaced "row" with "array"
Does a ct scan still emits radiation after you click the end scan?
There is an X-ray on light to let you know when there is radiation, but it is only during a scan. Not when gantry is warning up or slowing down