From hujitao226 at 163.com  Mon Sep  8 02:55:45 2025
From: hujitao226 at 163.com (=?UTF-8?B?6IOh57un5rab?=)
Date: Mon, 8 Sep 2025 08:55:45 +0800 (GMT+08:00)
Subject: [Rtk-users] Helical scan
Message-ID: <7f5adba9.2446e.19926d25fa2.Coremail.hujitao226@163.com>

Does RTK support helical (spiral) scanning? If so, how should it be used?




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hujitao226 at 163.com
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From simon.rit at creatis.insa-lyon.fr  Mon Sep  8 12:46:17 2025
From: simon.rit at creatis.insa-lyon.fr (Simon Rit)
Date: Mon, 8 Sep 2025 11:46:17 +0100
Subject: [Rtk-users] Helical scan
In-Reply-To: <7f5adba9.2446e.19926d25fa2.Coremail.hujitao226@163.com>
References: <7f5adba9.2446e.19926d25fa2.Coremail.hujitao226@163.com>
Message-ID: <CAF0oig3hyympyPxOA+2qXawT1vv2DfrdRbc2X=rxvcRms7vGwQ@mail.gmail.com>

Hi,
The RTK geometry does support the description of any scan. You can just
provide the 3D coordinates of each source and detector positions with the
method AddProjection
<https://www.openrtk.org/Doxygen/classrtk_1_1ThreeDCircularProjectionGeometry.html#a0fb1475ed76a28cde24fac85eae18e1e>
.
All iterative reconstruction algorithms will be to use any geometry.
However, there is no filtered backprojection algorithm for helical CT
reconstruction. The work had been started but has been stalled for a few
years now, see
https://github.com/RTKConsortium/RTK/pull/418
Simon

On Mon, Sep 8, 2025 at 3:21?AM ??? <hujitao226 at 163.com> wrote:

> Does RTK support helical (spiral) scanning? If so, how should it be used?
>
>
> ???
> hujitao226 at 163.com
>
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