scholarly journals Evaluation of Self-Produced Phantom Usafulness for image Quality Control of Radiation Generator for Diagnosis

2021 ◽  
Vol 12 (6) ◽  
pp. 828-834
Author(s):  
Ye-Won Park Et.al
Keyword(s):  
Quality Control ◽  
Medical Care ◽  
Qualitative Evaluation ◽  
High Contrast ◽  
Contrast Resolution ◽  
Low Contrast ◽  
X Ray ◽  
Image Quality Control ◽  
Exposure Dosage ◽  
The Difference

Background/Objectives: Quality control can improve the quality of medical care along with the stability of diagnostic X-ray generator. Regular quality control provides reliable quality control of the machine and maintains consistency of general imaging using radiation for efficient diagnosis. Methods/Statistical analysis: A phantom for quality control of diagnostic X-ray generator was produced using a 3D printer. Quantitative and qualitative evaluation of the phantom utility was conducted by modifying images acquired using S and D companies’ tools with Source to Image-Receptor Distance (SID) levels ranging between 130 cm and 180 cm. The evaluation indices were determined based on the analysis of field compliance, uniformity, low and high-contrast resolution, and linearity. Findings: The evaluation was conducted by acquiring and changing the radiographic image to SIDs between 130 cm and 180 cm using the indigenous phantom. The field compliance of S and D companies in terms of quantitative evaluation indices was both appropriate within ± 1% according to the SID change. To ensure a uniform SID 130 cm, the internal and external means of S company were 893 and 943, respectively, while those of the D company were 228.1 and 261.4, respectively. At an SID of 180 cm, the internal and external means of the S company were 928.1 and 958.4, respectively, while those of the D company were 257.2 and 299, respectively. A characteristic of the DR system was identified to ensure linearity, altered exposure dosage according to the step wedge height, and the difference in SI values according to the characteristics of the equipment and linearity. The qualitative evaluation indices were determined by identifying the size of the hole under high-contrast resolution up to 0.8㎜ and the bar size up to 1.6 lp/㎜. The low contrast resolution was evaluated with a C-D pattern, and at SID 130 cm, the S company scored 124.6 points and the D company 116 points, and at 180 cm, the S company scored 111.4 and the D company 104.6 points. Improvements/Applications: The utility of the homegrown phantom in quality control was confirmed for each index. The medical institutions are required to introduce quality control regulations for general image examination using radiation. It is helpful to efficiently manage old equipment and improve public health and medical care by linking with the health insurance fee.

scholarly journals [OA161] Quantification of low contrast resolution and noise of dual energy CT using software for automated quality control

2018 ◽  
Vol 52 ◽  
pp. 61-62
Author(s):  
Bartosz Pawalowski ◽  
Hubert Szweda ◽  
Piotr Romanski ◽  
Krzysztof Matuszewski ◽  
Urszula Sobocka-Kurdyk ◽  
...  
Keyword(s):  
Quality Control ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Contrast Resolution ◽  
Low Contrast ◽  
Automated Quality Control

scholarly journals LATEST TREND IN X-RAY CT SCANNER : CORRELATION BETWEEN PATIENT DOSE AND LOW CONTRAST RESOLUTION FOR GENERATIVE MODE

1994 ◽  
Vol 50 (1) ◽  
pp. 21-27
Author(s):  
YOSHIHISA MURAMATSU ◽  
KOUJI MISHIO ◽  
YUKIHIRO MATSUDA ◽  
HISAO NAKANO
Keyword(s):  
Patient Dose ◽  
Ct Scanner ◽  
Contrast Resolution ◽  
Low Contrast ◽  
X Ray

scholarly journals 346 Evaluation of low contrast resolution on Z-axis of X-ray CT using graded attenuation phantom.

1997 ◽  
Vol 53 (8) ◽  
pp. 1218
Author(s):  
Kenji Fujii ◽  
Shigeyoshi Tsujii ◽  
Satoru Kamiya ◽  
Motokazu Makino ◽  
Yoshihiro Ida ◽  
...  
Keyword(s):  
Contrast Resolution ◽  
Low Contrast ◽  
X Ray

scholarly journals Evaluation of the performance of radiological monitors in use, cities Salvador (BA) and Florianópolis (SC)

2019 ◽  
Vol 7 (3) ◽  
Author(s):  
Igor Fernando Modesto Garcia ◽  
Paulo Mauricio Almeida Geambastiani ◽  
Mário De Jesus Ferreira ◽  
Eric Matos Macedo ◽  
Marcus Vínicius Teixeira Navarro ◽  
...  
Keyword(s):  
Quality Control ◽  
Image Quality ◽  
Compliance Rate ◽  
Internal Reflection ◽  
Geometric Distortion ◽  
Contrast Resolution ◽  
Low Contrast ◽  
Room Illumination ◽  
High Illumination ◽  
General Aspects

Evaluate the performance of the monitors used for diagnosis based on the parameters defined by AAMP. Materials and Methods: Using calibrated instrumentation traceable to NIST and RBC, were evaluated in 15 monitors, according to the procedures described in AAMP's report 03 and the Spanish protocol in the following parameters: the general aspects of image quality, geometric distortion, screen reflection and room illumination, luminance response, luminance dependence, spatial and low contrast resolution, noise, internal reflection blanking and screen chromaticity. Results: 100% compliance for geometric distortion tests and 0% compliance for the luminance dependence test. Conclusions: There are nonspecific monitors for diagnosis being used for these purposes, without routinely checking tests, in rooms with high illumination and dirt on the screens and the non-implementation or inadequacy of acceptance and quality control tests. The monitors declared by the manufacturers as diagnostic specific on average showed a higher compliance rate

scholarly journals 369 Study of window function and low contrast resolution in X-ray CT

1997 ◽  
Vol 53 (8) ◽  
pp. 1241 ◽  
Author(s):  
Katsumi Tsujioka ◽  
Masaya Takase ◽  
Taichi Uemura ◽  
Chieko Hayashi ◽  
Yoshihiro Ida ◽  
...  
Keyword(s):  
Window Function ◽  
Contrast Resolution ◽  
Low Contrast ◽  
X Ray

scholarly journals A Complex C Region Genotype [? R] that with G B vlae Produces Dark Seal-brown Seedcoat Color in Common Bean

1996 ◽  
Vol 121 (4) ◽  
pp. 594-598 ◽  
Author(s):  
Mark J. Bassett
Keyword(s):  
Common Bean ◽  
Plant Introduction ◽  
Genotype Data ◽  
Breeding Line ◽  
Background Color ◽  
High Contrast ◽  
Question Mark ◽  
Low Contrast ◽  
The Difference

Common bean (Phaseolus vulgaris L.) plant introduction 527829 (formerly Lamprecht M0048) has dark seal-brown (DSB) seedcoats and pink flowers. An investigation was conducted to determine the genotype of DSB seedcoat color. M0048 was crossed with Florida breeding line 5-593, which has genotype P [C r] D J G B V Rk. A series of crosses involving M0048, 5-593, and three genetic tester stocks (v BC2 5-593, cu BC2 5-593, and b v BC2 5-593) led to determination of the genotype. Data analysis indicated that M0048 has the genotype P [? R] J G B vlae, where DSB color is produced by the interaction of R with B. Crosses between [? R] and testers with [C r] always produced seedcoat mottling in F1, except where V masks the effect. The cross [? R] B v (DSB) × cu BC2 5-593 (cartridge buff seedcoat) produced marbled seedcoats (black/cartridge buff) with genotype [? R]/[cu?] B V. No way was found to determine whether the mottled or marbled seedcoat patterns were controlled at C or R; hence, the allelic ambiguity is indicated with a question mark. Illustrations are provided showing the difference between seedcoat mottling (a highly variable low-contrast patterning) and seedcoat marbling (a less variable high-contrast patterning, usually with cartridge buff as the background color). The development of a new genetic tester stock, [? R] b v BC3 5-593, was described, where [? R] b v gives unpatterned dominant red seedcoat color.

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