Digital Radiography of the Spine, Large Bones and Joints Using Stimulable Phosphor

1988 ◽  
Vol 29 (3) ◽  
pp. 267-271 ◽  
Author(s):  
H. Pettersson ◽  
P. Aspelin ◽  
E. Boijsen ◽  
K. Herrlin ◽  
N. Egund
Keyword(s):  
Soft Tissue ◽  
Radiation Dose ◽  
Digital Radiography ◽  
High Spatial Resolution ◽  
Halo Effect ◽  
Film System ◽  
Unsharp Masking ◽  
Conventional Film ◽  
Screen System ◽  
Radiologic Features

The value of digital radiography in musculoskeletal disorders was investigated by assessing its ability to depict anatomic structures and common radiologic features as compared with the conventional film-screen combination. The digital image that was frequency modified was superior to conventional films in delineating soft tissue structures and for areas with large attenuation differences. The conventional film-screen system was superior in depicting small anatomic structures and in identifying the zone close to prostheses. This was explained by the high spatial resolution of the conventional film system and the disturbing halo effect around the prosthesis seen with digital images. The halo effect is an overshoot caused by the unsharp masking operator, which was in this series not changed for individual examinations. The exposure (radiation dose) could be reduced to 50 per cent using the digital system, without any loss of information.

Application of Adaptive Enhancement Means in Head and Neck CR Image

2012 ◽  
Vol 236-237 ◽  
pp. 409-413
Author(s):  
Ming Hui Zhang ◽  
Yao Yu Zhang
Keyword(s):  
Soft Tissue ◽  
Image Quality ◽  
Radiation Dose ◽  
Head And Neck ◽  
Clinical Diagnosis ◽  
Visual Effect ◽  
X Ray ◽  
Unsharp Masking ◽  
Adaptive Enhancement ◽  
Enhancement Algorithm

Digital CR of head and neck overcomes the disadvantage of regular X-ray radiography, which can not reveal bone and soft tissue position deficiency in one exposing, and reduces the X-ray radiation dose. Meanwhile, various factors cause the decline of image quality, and images must be enhanced in order to meet demands of doctor's clinical diagnosis. The general enhancement algorithms don’t consider body's structure differences and density characteristics. A new adaptive CR enhancement algorithm was proposed in this article, and head and neck CR images were processed with this method and compared with linear unsharp masking method. The experiment proves that the details of CR image enhanced were abundant and enhanced CR image had good visual effect, SNR was high, as well as detail variance /background variance (DV/BV) indicating that this algorithm is suitable for head and neck CR medical images

Assessment of image quality and radiation dose in some models of digital radiography systems – A Pehamed FLUORAD A + D phantom study

2018 ◽  
Vol 53 (2) ◽  
pp. 139-144
Author(s):  
H. Kaheni ◽  
A. Chaparian ◽  
R. Nafisi-Moghadam ◽  
N. Hamzian
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Digital Radiography ◽  
Quality Parameters ◽  
Digital Systems ◽  
Quality Performance ◽  
Dose Area Product ◽  
Ideal Situation ◽  
Conventional Film ◽  
Area Product

Digital radiography (DR) systems have been recently introduced as a developed technology that is replacing conventional film–screen systems in many countries around the world. Ideal situation in radiography is to maximize the image quality while minimizing the patient dose. The purpose of this study was to compare image quality and radiation dose in different digital radiography systems. Four different digital systems are compared in terms of their image quality performance and dose area product (DAP). Images of Pehamed FLUORAD A + D phantom were obtained for each DR system. Image quality parameters (contrast resolution (CR), spatial resolution (SR), and contrast-to-noise ratio (CNR)) and DAP were significantly different between different digital systems. It was shown that all four quantities increased with increasing exposure parameters in all systems. Image quality parameters of the SEDECAL system were higher than that in other systems (p ≤ 0.05). At the stable DAP (100 mGy.cm2), means of CR, CNR, and SR in the SEDECAL system were 6.38 ± 0.797, 29.70 ± 0.85 and 3.10 ± 0.38 lp/mm, respectively. The results of this investigation can be taken into consideration in the selection and purchasing of new systems in order to preserve patients as well as radiographers from unnecessary radiation dose.

Film-Screen Vs. Digital Radiography in Rheumatoid Arthritis of the Hand

1994 ◽  
Vol 35 (4) ◽  
pp. 311-318 ◽  
Author(s):  
Á. Jónsson ◽  
A. Borg ◽  
P. Hannesson ◽  
K. Herrlin ◽  
K. Jonsson ◽  
...  
Keyword(s):  
Rheumatoid Arthritis ◽  
Soft Tissue ◽  
Digital Radiography ◽  
Joint Space Narrowing ◽  
Digital Images ◽  
Roc Curves ◽  
Joint Space ◽  
Hard Copy ◽  
Significant Difference ◽  
Soft Tissue Swelling

In a prospective investigation the diagnostic accuracy of film-screen and digital radiography in rheumatoid arthritis of hands was compared. Seventy hands of 36 patients with established rheumatoid arthritis were included in the study. Each of 11 joints in every hand was evaluated regarding the following radiologic parameters: soft tissue swelling, joint space narrowing, erosions and periarticular osteopenia. The digital images were obtained with storage phosphor image plates and evaluated in 2 forms; as digital hard-copy on film and on a monitor of an interactive workstation. The digital images had a resolution of either 3.33 or 5.0 lp/mm. ROC curves were constructed and comparing the area under the curves no significant difference was found between the 3 different imaging forms in either resolution group for soft tissue swelling, joint space narrowing and erosions. The film-screen image evaluation of periarticular osteopenia was significantly better than the digital hard-copy one in the 3.33 lp/mm resolution group, but no significant difference was found in the 5.0 lp/mm group. These results support the view that currently available digital systems are capable of adequate diagnostic performance.

scholarly journals Knowledge Level of Iranian Dental Practitioners Towards Digital Radiography And Cone-Beam Computed Tomography

2021 ◽  
Vol 24 (2) ◽  
Author(s):  
Fatemeh Salemi ◽  
Abbas Shokri ◽  
Maryam Foroozandeh ◽  
Maryam Farhadian ◽  
Ayoub Yeganeh
Keyword(s):  
Computed Tomography ◽  
Radiation Dose ◽  
Digital Radiography ◽  
Cone Beam Computed Tomography ◽  
Work Experience ◽  
Further Education ◽  
Cone Beam ◽  
Knowledge Level ◽  
Dental Practitioners ◽  
Significant Difference

Objective: This study aimed to assess the knowledge level of Iranian dental practitioners about digital radiography(DR) andcone-beamcomputedtomography (CBCT). Material and Methods: In this crosssectional study, a researcher-designed questionnaire was administered among 180 general dentists and specialists. The questionnaire had three main domains of demographic information, fifteen questions about knowledge of DR (advantages, disadvantages, physical properties) and twenty six questions about knowledge of CBCT (indications, applications, advantages, route of knowledge acquisition). Data were analyzed using descriptive statistics, t-test and Pearson’s correlation coefficient. Results: Of 180 participants, 76 (42.2%) were females. The minimum, maximum and mean± standard deviation scores obtained in DR were 4, 14, and 9.031 ± 1.85 and in CBCT were 0,26 and 18.56 ± 4.81, respectively. In the CBCT domain, the participants had maximum knowledge about “low radiation dose” (72.8%) and minimum knowledge about the “role of CBCT in determination of bone density” (45%). In DR domain, the participants had maximum knowledge about “no need for radiographic films” (75.6%) and minimum knowledge about “not requiring manual processing” (15.6%). Overall, participants had higher level of knowledge about CBCT than DR. An inverse correlation was noted between age and work experience with the number of correct answers. However, no significant difference was noted in the knowledge level of males and females regarding CBCT or DR (p = 0.233 and p = 0.227, respectively). Conclusions: further education seem imperative for dentists in this respect for more efficient diagnosis and treatment planning, minimize patient radiation dose and save time and cost.   Keywords Digital radiography; Cone-Beam computed tomography; Knowledge; Dentists.

scholarly journals Feasible Dose Reduction in Routine Chest Computed Tomography Maintaining Constant Image Quality Using the Last Three Scanner Generations: From Filtered Back Projection to Sinogram-affirmed Iterative Reconstruction and Impact of the Novel Fully Integrated Detector Design Minimizing Electronic Noise

2014 ◽  
Vol 4 ◽  
pp. 38 ◽  
Author(s):  
Lukas Ebner ◽  
Felix Knobloch ◽  
Adrian Huber ◽  
Julia Landau ◽  
Daniel Ott ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Soft Tissue ◽  
Radiation Dose ◽  
Dose Reduction ◽  
Integrated Circuit ◽  
Chest Ct ◽  
Back Projection ◽  
Dose Length Product ◽  
Chest Computed Tomography ◽  
Tube Current

Objective: The aim of the present study was to evaluate a dose reduction in contrast-enhanced chest computed tomography (CT) by comparing the three latest generations of Siemens CT scanners used in clinical practice. We analyzed the amount of radiation used with filtered back projection (FBP) and an iterative reconstruction (IR) algorithm to yield the same image quality. Furthermore, the influence on the radiation dose of the most recent integrated circuit detector (ICD; Stellar detector, Siemens Healthcare, Erlangen, Germany) was investigated. Materials and Methods: 136 Patients were included. Scan parameters were set to a thorax routine: SOMATOM Sensation 64 (FBP), SOMATOM Definition Flash (IR), and SOMATOM Definition Edge (ICD and IR). Tube current was set constantly to the reference level of 100 mA automated tube current modulation using reference milliamperes. Care kV was used on the Flash and Edge scanner, while tube potential was individually selected between 100 and 140 kVp by the medical technologists at the SOMATOM Sensation. Quality assessment was performed on soft-tissue kernel reconstruction. Dose was represented by the dose length product. Results: Dose-length product (DLP) with FBP for the average chest CT was 308 mGy*cm ± 99.6. In contrast, the DLP for the chest CT with IR algorithm was 196.8 mGy*cm ± 68.8 (P = 0.0001). Further decline in dose can be noted with IR and the ICD: DLP: 166.4 mGy*cm ± 54.5 (P = 0.033). The dose reduction compared to FBP was 36.1% with IR and 45.6% with IR/ICD. Signal-to-noise ratio (SNR) was favorable in the aorta, bone, and soft tissue for IR/ICD in combination compared to FBP (the P values ranged from 0.003 to 0.048). Overall contrast-to-noise ratio (CNR) improved with declining DLP. Conclusion: The most recent technical developments, namely IR in combination with integrated circuit detectors, can significantly lower radiation dose in chest CT examinations.

Digital Urography Using Stimulable Phosphor an Experimental Study in the Rabbit

1988 ◽  
Vol 29 (3) ◽  
pp. 273-275 ◽  
Author(s):  
H. Pettersson ◽  
P. Aspelin ◽  
E. Bousen
Keyword(s):  
Experimental Study ◽  
Body Weight ◽  
Radiation Dose ◽  
Contrast Medium ◽  
Imaging Systems ◽  
Loss Of Information ◽  
Conventional Film ◽  
Digitized Images ◽  
Different Doses

In a urographic experimental study in six rabbits conventional film-screen images were compared with digitized images. Two digitized images were examined, one simulating the conventional film-screen combination, and one frequency modified. The nephrographic and excretory phases of four different doses of contrast medium (iohexol, 350 mg I/ml) were investigated in each rabbit (4, 2, 1, and 0.5 ml/kg body weight). No differences were found between the different doses of contrast medium for the two imaging systems. With digitized images the exopsure (radiation dose) could be decreased to 12.5 per cent of the conventional film-screen combination without any loss of information.

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