scholarly journals Noval advance non-linear descriptor and characteristic equivalency to predict CT from MRI image

Author(s):  
Sowmya Bachu ◽  
Shrutibhargava Choubey ◽  
Abhishek Choubey

Attenuation correction designed for PET/MR hybrid imaging frameworks along with portion making arrangements used for MR-based radiation treatment remain testing because of lacking high-energy photon weakening data. We present a new method so as to uses the learned nonlinear neighborhood descriptors also highlight coordinating toward foresee pseudo-CT pictures starting T1w along with T2w MRI information. The nonlinear neighborhood descriptors are acquired through anticipating the direct descriptors interested in the nonlinear high-dimensional space utilizing an unequivocal constituent guide also low-position guess through regulated complex regularization. The nearby neighbors of every near descriptor inside the data MR pictures are looked during an obliged spatial extent of the MR pictures among the training dataset. By that point, the pseudo-CT patches are evaluated through k-closest neighbor relapse. The planned procedure designed for pseudo-CT forecast is quantitatively broke downward on top of a dataset comprising of coordinated mind MRI along with CT pictures on or after 13 subjects.

Author(s):  
M Behmadi ◽  
H Gholamhosseinian ◽  
M Mohammadi ◽  
Sh Naseri ◽  
M Momennezad ◽  
...  

Background: Given the importance of scattered and low doses in secondary cancer caused by radiation treatment, the point dose of critical organs, which were not subjected to radiation treatment in breast cancer radiotherapy, was measured.Objective: The purpose of this study is to evaluate the peripheral dose in two techniques of breast cancer radiotherapy with two energies. Methods: Eight different plans in two techniques (conventional and conformal) and two photon energies (6 and 15 MeV) were applied to Rando Alderson Phantom’s DICOM images. Nine organs were contoured in the treatment planning system and specified on the phantom. To measure the photon dose, forty-eight thermoluminescence dosimeters (MTS700) were positioned in special places on the above nine organs and plans were applied to Rando phantom with Elekta presice linac. To obtain approximately the same dose distribution in the clinical organ volume, a wedge was used on planes with an energy of 6 MeV photon.         Results: Point doses in critical organs with 8 different plans demonstrated that scattering in low-energy photon is greater than high-energy photon. In contrast, neutron contamination in high-energy photon is not negligible. Using the wedge and shield impose greater scattering and neutron contamination on patients with low-and high-energy photon, respectively.    Conclusion: Deciding on techniques and energies required for preparing an acceptable treatment plan in terms of scattering and neutron contamination is a key issue that may affect the probability of secondary cancer in a patient.


1986 ◽  
Author(s):  
B.J. Mijnheer ◽  
A.H.L. Aalbers ◽  
J.J.M. Van Gasteren ◽  
A.G. Visser ◽  
F.W. Wittkämper

2020 ◽  
Vol 65 (19) ◽  
pp. 195006
Author(s):  
David J Eaton ◽  
Graham Bass ◽  
Paul Booker ◽  
John Byrne ◽  
Simon Duane ◽  
...  

2005 ◽  
Vol 76 ◽  
pp. S195
Author(s):  
J. Cygler ◽  
A. Saoudi ◽  
C. Lambert ◽  
A. Hallil ◽  
M. Brown ◽  
...  

1997 ◽  
Vol 43 (3) ◽  
pp. 311-313 ◽  
Author(s):  
Rickard Sjögren ◽  
Magnus G. Karlsson ◽  
Mikael Karlsson ◽  
Hans Svensson

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