isometric fan-beam CTs

[chiyanmeng121]

Excellent work, is it possible to perform reconstruction of isometric fan-beam CTs？

[kylechampley]

I am not familiar with the term "isometric fan-beam"; can you explain what you mean by this?

LEAP does support fan-beam geometries.

[chiyanmeng121]

Hi, I mean equian-gular fan-beam CT scans where the angles between the rays are all equal, can LEAF achieve this?     ------------------ Original ------------------ From: ***@***.***>; Date:  Sat, Jan 25, 2025 01:09 AM To: ***@***.***>; Cc: ***@***.***>; ***@***.***>; Subject:  Re: [LLNL/LEAP] isometric fan-beam CTs (Issue #146)   I am not familiar with the term "isometric fan-beam"; can you explain what you mean by this? LEAP does support fan-beam geometries. — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you authored the thread.Message ID: ***@***.***>

[kylechampley]

Ah, I see. Unfortunately, no, but LEAP does support curved detector panels for cone-beam data.

[chiyanmeng121]

Can I set the three dimensional cone-beam curve detector to a single layer, and then set the arc lengths of the surface detector to be equal. This method is used to approximate equianglar fan-beam CT.

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--------------原始邮件-------------- 发件人："Kyle Champley ***@***.***>; 发送时间：2025年1月26日(星期天) 凌晨2:23 收件人："LLNL/LEAP" ***@***.***>; 抄送："池艳猛 ***@***.***>;"Author ***@***.***>; 主题：Re: [LLNL/LEAP] isometric fan-beam CTs (Issue #146) ----------------------------------- Ah, I see. Unfortunately, no, but LEAP does support curved detector panels for cone-beam data. — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you authored the thread.Message ID: ***@***.***>

[chiyanmeng121]

In fact, I wanted to take advantage of LEAF's ability to propagate gradients and do equianglar fan-beam CT reconstruction, which LEAF can do.

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--------------原始邮件-------------- 发件人："池艳猛 ***@***.***>; 发送时间：2025年1月26日(星期天) 上午8:17 收件人："llnl/leap" ***@***.***>;"LLNL/LEAP" ***@***.***>; 抄送："Author ***@***.***>; 主题：回复:Re: [LLNL/LEAP] isometric fan-beam CTs (Issue #146) ----------------------------------- Can I set the three dimensional cone-beam curve detector to a single layer, and then set the arc lengths of the surface detector to be equal. This method is used to approximate equianglar fan-beam CT.

--------------原始邮件-------------- 发件人："Kyle Champley ***@***.***>; 发送时间：2025年1月26日(星期天) 凌晨2:23 收件人："LLNL/LEAP" ***@***.***>; 抄送："池艳猛 ***@***.***>;"Author ***@***.***>; 主题：Re: [LLNL/LEAP] isometric fan-beam CTs (Issue #146) ----------------------------------- Ah, I see. Unfortunately, no, but LEAP does support curved detector panels for cone-beam data. — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you authored the thread.Message ID: ***@***.***>

[kylechampley]

Yes, if you use a single-row cone-beam geometry, it will be close to what you want. Don't forget to specify the detector as curved to get the equi-angular sampling. You can do it like this:

leapct.set_conebeam(...)
leapct.set_curvedDetector()