[Rtk-users] The Reconstruction Result has blur-image its possible due to motion blur effect or not? how can reduce it or correct it ?

[Simon Rit]

Hi,
1) I don't know what type of motion you are dealing with. You can read e.g.
here <http://dx.doi.org/10.1118/1.3115691>
<https://apis.ebsco.com/public/linkout/v1/ftf?ref=792a0735-69d6-405a-bd13-f5380020ce8b&id=302229>
or here <http://doi.org/10.1088/1742-6596/489/1/012026>
<https://doi.org/10.1088/1742-6596/489/1/012026> how we estimated motion in
our case but I won't be able to help more.
2) The slant is adjusted with the GantryAngle + source distance and offsets
since, in the detector coordinate system, the source is moving.
3) You will have to through the command lines.
Simon

On Thu, Feb 16, 2023 at 8:23 AM 何明哲 <m10512067 at yuntech.org.tw> wrote:

>
> hi Simon thanks for your reply, but I still have some question ,
>
> 1) This is for non-rigid motion. If the motion is rigid, it can be
> compensated by adjusting the source and detector positions and orientation
> wrt to the object in the geometry file.
> --> So this example is not suitable for dental CBCT? Or the motion blur of
> dental CBCT can be ignored in the RTK algorithm because the motion is
> rigid?
>

> 2) Again, detector parallel to isocenter is meaning less, the isocenter is
> a point. And the goal of the geometry description is no to "make them
> parallel" but to account for the actual geometry of the system wrt scanned
> object.
> --> If I need to ad adjust the Slant Case (the pic below is )，What methods
> or parameters can I use to adjust it?
> [image: image200.png]
>
> (Pic form Wang, Zhao, et al. "Improvements in micro-CT method for
> characterizing x-ray monocapillary optics." *Optics Communications* 504
> (2022): 127474)
>
> 3) If I want to try to use dental CBCT or chest cavity CBCT to implement
> and study the MCCBCTReconsttruction example
> <https://wiki.openrtk.org/index.php/RTK/Examples/MCCBCTReconstruction#Deformation_vector_field>,
> how can I collect or generate deformat.mha and motion signal.txt ?
>
> Thanks for reply again.
>
> BR,
>
>
> Simon Rit <simon.rit at creatis.insa-lyon.fr> 於 2023年2月13日 週一 下午5:40寫道：
>
>> 1) This is for non-rigid motion. If the motion is rigid, it can be
>> compensated by adjusting the source and detector positions and orientation
>> wrt to the object in the geometry file.
>> 2) Again, detector parallel to isocenter is meaning less, the isocenter
>> is a point. And the goal of the geometry description is no to "make them
>> parallel" but to account for the actual geometry of the system wrt scanned
>> object.
>>
>> On Mon, Feb 13, 2023 at 9:44 AM 何明哲 <m10512067 at yuntech.org.tw> wrote:
>>
>>> Hi Simon
>>> Thanks for reply，
>>>
>>> 1) I understand what you mean, I will be check out geometric parameter
>>> again , but if there is a motion blur caused by the motion of the gantry,
>>> is there any suggested way to correct it? I have reference to
>>> RTK/Examples/MCCBCTReconstruction
>>> <https://wiki.openrtk.org/index.php/RTK/Examples/MCCBCTReconstruction#Deformation_vector_field>,
>>> but this is an example of the motion signal of the chest cavity, If it is
>>> dental CBCT case, which file or format should the motion signal be in? Or
>>> is there a document for reference?
>>>
>>> 2) Thanks for your reply, I understand, because the source is considered
>>> as a point, so if the detector is not parallel to the ISO Center, I just
>>> adjust the  out of plane angle to make them parallel, am I right?
>>>
>>> The picture below is
>>>
>>> [image: 圖片1.bmp]
>>>
>>> thanks for your reply,
>>> BR,
>>>
>>>
>>>
>>> Simon Rit <simon.rit at creatis.insa-lyon.fr> 於 2023年2月13日 週一 下午2:32寫道：
>>>
>>>> Hi,
>>>> 1) I don't think this is due to detector blur. It seems to be a
>>>> geometric problem. But it is hard to adjust it manually, this is generally
>>>> calibrated.
>>>> 2) I'm not sure I understand what your mean by "parallel to the source"
>>>> as the source is assumed to be a point. If you only change SID, SDD, the 2
>>>> source and detector X/Y offsets, the Gantry Angle and the in plane angle,
>>>> the detector is parallel to the rotation axis. The out of plane angle is
>>>> the angle between the axis and the detector.
>>>> Simon
>>>>
>>>> On Fri, Feb 10, 2023 at 12:02 PM 何明哲 <m10512067 at yuntech.org.tw> wrote:
>>>>
>>>>>
>>>>> Hi All
>>>>>
>>>>> I have use the CudaFDKConeBeamReconstructionFilter  algorithm to
>>>>> reconstruct a set of CBCT images,
>>>>> 1. )but I found that each slices contains blurry image area , because
>>>>> I was using a flat panel detector   , so I tried to adjust the source
>>>>> offset , inofplaneangle and outofplaneangle , but the blurry image
>>>>> area  still at there, could this be due to detector motion blur effect? Or
>>>>> is there a suggested way to correct it?
>>>>>
>>>>> 2). From the reference http://www.openrtk.org/Doxygen/DocGeo3D.html I
>>>>> can know that adjusting the source offset and inofplaneangle /
>>>>> outofplaneangle can ensure that the detector remains parallel to the
>>>>> source, But how can I make sure that the Z-axis of the ISO, the detector
>>>>> and the source are also kept parallel at the same time, Can I achieve this
>>>>> by adjusting any parameters or using any method?
>>>>>
>>>>> The picture below is my result  for Question 1.
>>>>> [image: 圖片1.png]
>>>>>
>>>>> thanks for your reply,
>>>>> BR,
>>>>>
>>>>> 回覆轉寄
>>>>> _______________________________________________
>>>>> Rtk-users mailing list
>>>>> rtk-users at openrtk.org
>>>>> https://www.creatis.insa-lyon.fr/mailman/listinfo/rtk-users
>>>>>
>>>>
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