Evidence map›Paper›PMID 27777787›Full record

ArticleBiomedical physics & engineering express2016

Practical alignment method for X-ray spectral measurement in micro-CT system based on 3D printing technology.

Liqiang Ren, Di Wu, Yuhua Li, Bin Zheng, Yong Chen, Kai Yang, Hong Liu

Open access · greenAbstract read
PubMed Full text at PMC Publisher
In one paragraph

Article in Biomedical physics & engineering express, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.

0numbers the graph read from it
0cells of the map it votes in
1citing papers in PubMed
0.3field-weighted citation impact, top 36% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

1 citing paper in PubMed, 2 citations in OpenAlex.

  1. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

7 authors at 1 institution in 1 country.

Liqiang RenCenter for Biomedical Engineering and School of Electrical and Computer Engineering, University of Oklahoma, Norman, OK 73019, USA.
Di WuCenter for Biomedical Engineering and School of Electrical and Computer Engineering, University of Oklahoma, Norman, OK 73019, USA.
Yuhua LiCenter for Biomedical Engineering and School of Electrical and Computer Engineering, University of Oklahoma, Norman, OK 73019, USA.
Bin ZhengCenter for Biomedical Engineering and School of Electrical and Computer Engineering, University of Oklahoma, Norman, OK 73019, USA.
Yong ChenDepartment of Radiation Oncology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73014, USA.
Kai YangDepartment of Radiology, Massachusetts General Hospital, Boston, MA 02114, USA.
Hong LiuCenter for Biomedical Engineering and School of Electrical and Computer Engineering, University of Oklahoma, Norman, OK 73019, USA.
Massachusetts General Hospital · US

Funding

Clinical Translation of High Energy Phase-Sensitive X-ray Breast TomosynthesisR01CA193378 · NCI · UNIVERSITY OF OKLAHOMA · PI FAJARDO, LAURIE L, JING, ZHENXUE · 2015 to 2019
$3.0M
NCI NIH HHS R01 CA193378
6 · The paper itself

Abstract

This study presents a practical alignment method for X-ray spectral measurement in a rotating gantry based micro-computed tomography (micro-CT) system using three-dimensional (3D) printing technology. In order to facilitate the spectrometer placement inside the gantry, supporting structures including a cover and a stand were dedicatedly designed and printed using a 3D printer. According to the relative position between the spectrometer and the stand, the upright projection of the spectrometer collimator onto the stand was determined and then marked by a tungsten pinhole. Thus, a visible alignment indicator of the X-ray central beam and the spectrometer collimator represented by the pinhole was established in the micro-CT live mode. Then, a rough alignment could be achieved through repeatedly adjusting and imaging the stand until the pinhole was located at the center of the acquired projection image. With the spectrometer being positioned back onto the stand, the precise alignment was completed by slightly translating the spectrometer-stand assembly around the rough location, until finding a "sweet spot" with the highest photon rate and proper distribution of the X-ray photons in the resultant spectrum. The spectra were acquired under precise alignment and misalignment of approximately 0.2, 0.5, and 1.0mm away from the precise alignment position, and then were compared in qualitative and quantitative analyses. Qualitative analysis results show that, with slight misalignment, the photon rate is reduced from 1302 to 1098, 1031, and 416 photons/second (p/s), respectively, and the characteristic peaks in the acquired spectra are gradually deteriorated. Quantitative analysis indicates that the energy resolutions for characteristic peak of

Indexed as

micro-computed tomography (micro-CT) systemrough and precise alignmentspectral measurementspectrometer placement

Identifiers

PMID27777787
PMCPMC5074344
OpenAlexW2464966738

What OpenQuestion holds

Textmetadata
LicenceTDM
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.