x ray and tomography版杨2014年暑期实习报告

杨仪萌2014年暑期实习报告

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“天津耀华中学实验四年三班杨仪萌的暑期实习报告”

newmethodforthedeterminationofthecenterofrotationintomography

July2014

YimengYang

SLACNationalAcceleratorLaboratory

Tomography

Tomographyreferstoimagingbysectionsorsectioning,throughtheuseofanykindof

penetratingwave.

Picturesfrom:

/wiki/Tomography

/OurServices/DITR/CT-Scan.cfm

X-ray

Picturefrom:/wiki/File:EM_Spectrum_Properties_edit.svg

Picturefrom:

/422-004+M.+Killeen+Big+Timeline+Project

SYNCHROTRON

Asynchrotronisaparticulartypeofcyclicparticleaccelerator.

Picturesfrom:

/wiki/Synchrotron_light_source

/wiki/Synchrotron

Beamline

Linac

Picturesfrom:

/wiki/SLAC_National_Accelerator_Laboratory

https

://w

ww

.fli

c

/photos/slaclab/8282691262/

Picturesfrom:

/2013/08/04/shiny-object-no-27-vulnerability/

/wallpapers/GTa/Xr6/GTaXr68Ty.jpg

PROCESS

http://www.psi.ch/niag/neutron-tomography

Takephotos

/en/company/technology/principles_of_operation/principle_060.html

sinogram

https://miac.unibas.ch/PMI/03-ComputedTomography.html:

/2013/08/04/shiny-object-no-27-

vulnerability/

reconstruct

/pages/labsite/2008/psych221/projects/08/AdamWang/project_report.htm

/wiki/X-ray_computed_tomography

/new-automated-tomography-imaging-process-speeds-up-whole-brain-mapping

/usa/products/orthopantomograph-op200-d/volumetric-tomography.aspx

/nrmicro/journal/v7/n9/fig_tab/nrmicro2183_F3.html

CT

/imaging/techniques/ct_ima

ng/

Howitworks

Center-of-MassMethod

ImageRegistrationMethod

Method

CalculationoftherotationalcentersincomputedtomographysinogramsStephenG.AzevedoIEEEranslationonnuclearsciencevol.37no.4August1990

AutomateddeterminationofthecenterofrotationintomographydataTilmanDonath,FelixBeckmann,andAndreasSchreyerGKSS-ResearchCenter,Max-Planck-Strasse1,21502Geesthacht,GermanyJ.Opt.Soc.Am.A/Vol.23,No.5/May2006

Addsomeblankareatotheimagetoadjusttherotationalcenter.

Rotatetheimage.

Afteradjustingtherotation

θ=2α

α：theanglebetweentherealrotationcenterandtheidealrotationcenter

L=2x

x:theoffsetbetweentherealrotationcenterandtheidealrotationcenter

Withoutliers

Withoutoutliers

Pikachufrom:

/i?ct=503316480&z=0&tn=baiduimagedetail&ipn=d&word=pikachu&step_word=&pn=1&spn=0&di=156917056560&rn=1&is=&istype=&ie=utf-8&oe=utf-

8&in=8898&cl=2&lm=-1&st=&cs=688838882%2C784854337&os=2710650013%2C1867062705&ln=1000&fr=ala1&fmq=1407787092350_R&ic=&s=&se=&sme=0&tab=&width=&height=&face=&ist=&jit=&cg=&ob

=http%3A%2F%2Fimg.topit.me%2Fl%2F201004%2F18%2F12715343253319.jpg&fromurl=ippr_z2C%24qAzdH3FAzdH3Fooo_z%26e3Bp5rtp_z%26e3B4jAzdH3Fwsk74AzdH3Fmln9AzdHtpj4AzdH3Fdalld0

t

/help/vision/ref/showmatchedfeatures.html

/help/images/examples/find-image-rotation-and-scale-using-automated-feature-matching.h

/help/images/ref/imrotate.html

/help/images/ref/imtranslate.html

salt&

pepper

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

0.45

0.5

0

results1

44.84

45.12

44.66

45.35

44.72

44.77

45.26

46.15

-170.58

-68.56

44.84

results2

45.05

45.06

44.93

45.76

44.95

45.25

54.13

42.75

128.76

-24.07

45.05

results3

45.13

44.91

44.84

44.72

44.04

-155.34

35.81

44.31

-51.53

59.34

45.13

Gaussian

44.81

44.90

44.92

45.15

45.06

44.97

45.02

44.97

45.01

44.98

44.81

45.27

45.16

44.84

44.89

45.18

45.14

44.98

45.01

44.98

45.10

45.27

Salt&pepper0.25

Gaussian0.25

/wiki/Salt-and-pepper_noise

salt&

pepper

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

0.45

0.5

0

30.07

30.03

30.08

29.91

30.91

29.68

27.75

29.09

28.27

11.71

30

29.89

29.78

30.42

30.02

30.28

31.57

28.53

27.14

29.04

9.17

30

Gaussian30.00

29.96

30.02

29.94

30.04

29.98

29.94

29.96

29.99

30.09

29.98

30.16

30.03

30.07

29.98

29.99

30.03

29.98

30.02

29.96

Imagesofporousmaterialcollectedusingsynchrotronbeamline

Nocorrection Bothcorrected

Onlyrotationcorrected Onlytranslationcorrected

0.05

0.1

0.15

0.2

0

salt&pepper

1.98

1.89

1.79

27.3

1.8

6.31

6.59

5.64

57.7

6.45

1.78

1.69

1.13

2.69

1.81

6.11

6.63

0.53

14.31

6.49

1.9

1.76

2.12

7.21

1.81

1.98

1.89

1.79

27.3

1.8

Gaussian

6.31

6.59

5.64

57.7

6.45

1.78

1.69

1.13

2.69

1.81

6.11

6.63

0.53

14.31

6.49