The impact of image compression on diagnostic quality of digital images for detection of chemically-induced periapical lesions

2004 ◽  
Vol 33 (1) ◽  
pp. 37-43 ◽  
Author(s):  
L Koenig ◽  
E Parks ◽  
M Analoui ◽  
G Eckert
Keyword(s):  
Image Compression ◽  
Digital Images ◽  
Diagnostic Quality ◽  
Periapical Lesions ◽  
Chemically Induced ◽  
The Impact

scholarly journals Digitally Scanned Radiographs versus Conventional Films for Determining Clarity of Periapical Lesions and Quality of Root Canal Treatment

2017 ◽  
Vol 2017 ◽  
pp. 1-5
Author(s):  
Kholod Almanei ◽  
Rakan Alsulaimani ◽  
Sarah Alfadda ◽  
Sarah Albabtain ◽  
Reem Alsulaimani
Keyword(s):  
Root Canal ◽  
Digital Images ◽  
Root Canal Treatment ◽  
Quality Data ◽  
Endodontically Treated Teeth ◽  
Conventional Radiograph ◽  
Diagnostic Quality ◽  
X Ray ◽  
Periapical Lesions

Aim. To compare digital images of conventional radiographs with the original radiographs for perceived clarity of periapical lesions and the quality of root canal treatment. Materials and Methods. One hundred and four intraoral periapical radiographs of patients with endodontically treated teeth were randomly selected. The radiographs were digitized using an MD300 USB X-ray Reader. The digital images were transferred to an HP laptop. Three evaluators compared each conventional radiograph with the matching digital image. The images were ranked for clarity and assessed for diagnostic quality; data were analyzed using the Reliability Calculation “ReCal.” Results. Both the digital images and conventional films had comparable clarity and diagnostic quality. Results indicated a moderate agreement between the evaluators. Conclusions. Conventional radiographs digitized using an MD300 USB X-ray Reader have similar clarity and diagnostic quality in comparison to the original radiographs.

Digital Image Documentation for Quality Assessment

2001 ◽  
Vol 125 (11) ◽  
pp. 1430-1435
Author(s):  
Domingos Cruz ◽  
Carla Valentí ◽  
Aureliano Dias ◽  
Mário Seixas ◽  
Fernando Schmitt
Keyword(s):  
Quality Assessment ◽  
Digital Image ◽  
Feasible Solution ◽  
Digital Images ◽  
Region Of Interest ◽  
Routine Practice ◽  
Diagnostic Quality ◽  
Higher Power ◽  
The Impact

Abstract Objective.—To demonstrate the feasibility of the use of digital images to document routine cases and to perform diagnostic quality assessment. Methods.—Pathologists documented cases by acquiring up to 12 digital images per case. The images were sampled at 25:1, 50:1, 100:1, 200:1, or 400:1 magnifications, according to adequacy in aiding diagnosis. After each acquisition, the referral pathologist marked a region of interest within each acquired image in order to evaluate intrinsic redundancy. The extrinsic redundancy was determined by counting the unnecessary images. Cases were randomly selected and reviewed by one pathologist. The quality of each image, the possibility of accomplishing a diagnosis based on images, and the degree of agreement was evaluated. Results.—During routine practice, 1469 cases were documented using 3902 images. Most of the images were acquired at higher power magnifications. From all acquired cases, 143 cases and their 373 related images were randomly selected for review. In 88.1% (126/143) of reviewed cases, it was possible to accomplish the diagnosis based on images. In 30.2% (38/126) of these cases, the reviewer considered that the diagnosis could be accomplished with fewer images. The referral pathologist and the reviewer found intrinsic redundancy in 57.8% and 54.5% of images, respectively. Conclusions.—Our results showed that digital image documentation to perform diagnostic quality assessment is a feasible solution. However, owing to the impact on routine practice, guidelines for acquisition and documentation of cases may be needed.

The impact on diagnostic quality of using contrast media in PET-CT studies

2010 ◽  
Vol 52 (4) ◽  
pp. 327-332
Author(s):  
M. García García-Esquinas ◽  
A. Ortega Candil ◽  
L. Lapeña Gutierrez ◽  
J. Mucientes Rasilla ◽  
J.L. Carreras Delgado ◽  
...  
Keyword(s):  
Contrast Media ◽  
Diagnostic Quality ◽  
Pet Ct ◽  
The Impact ◽  
Ct Studies

WAVELET-BASED MEDICAL IMAGE COMPRESSION USING EZW: OBJECTIVE AND SUBJECTIVE EVALUATIONS

2004 ◽  
Vol 04 (01) ◽  
pp. 93-110 ◽  
Author(s):  
YIN FEN LOW ◽  
ROSLI BESAR
Keyword(s):  
Image Compression ◽  
Medical Image ◽  
Wavelet Decomposition ◽  
Perceptual Quality ◽  
Wavelet Filters ◽  
Subjective Evaluations ◽  
Varying Length ◽  
Energy Compaction ◽  
The Impact

Recently, the wavelet transform has emerged as a cutting edge technology within the field of image compression research. Wavelet methods involve overlapping transforms with varying-length basis functions. This overlapping nature of the transform alleviates blocking artifacts, while the multi-resolution character of the wavelet decomposition leads to superior energy compaction and perceptual quality of the decompressed image. Embedded zerotree wavelet (EZW) coder is the first algorithm to show the full power of wavelet-based image compression. The main purpose of this paper is to investigate the impact and quality of orthogonal wavelet filter in compressing medical image by using EZW. Meanwhile, we also look into the effect of the level of wavelet decomposition towards compression efficiency. The wavelet filters used are Haar and Daubechies. The compression simulations are done on three modalities of medical images. The objective (based on PSNR) and subjective (perceived image quality) results of these simulations are presented.

scholarly journals The interaction and interference of preformed metal crowns on magnetic resonance imaging: a scoping review with a systematic methodology

2021 ◽  
Author(s):  
O. Sumner ◽  
R. Goldsmith ◽  
N. Heath ◽  
G. D. Taylor
Keyword(s):  
Neck Region ◽  
Diagnostic Value ◽  
In Vivo Studies ◽  
Resonance Imaging ◽  
Head And Neck Region ◽  
Diagnostic Quality ◽  
Preformed Metal Crowns ◽  
The Impact

Abstract Purpose Preformed metal crowns are widely used to restore primary and permanent teeth. Children may require magnetic resonance imaging (MRI) for diagnosis and monitoring of diseases in the head and neck region. Metallic objects, in the field of view, may compromise the diagnostic value of an MRI. The impact on the diagnostic quality of an MRI in children who have had preformed metal crowns placed has not been assessed. The aim of this systematic review was to evaluate the impact that PFMCs have on MRI imaging quality and thus the overall diagnostic value. Methods Electronic searches of the following databases were completed: MEDLINE, EMBASE, Cochrane Library, Web of Science and Open Grey. Primary in vivo studies on children who had at least one preformed metal crown placed and required an MRI investigation were to be included. PRISMA guidelines were followed and screening/data extraction was carried out by two independent calibrated reviewers. Results A total of 7665 articles were identified. After removing duplicates, 7062 were identified for title and abstract screening. Thirty-four articles underwent full-text review, of which none met the inclusion criteria. Most common reasons for exclusion were not placing preformed metal crowns (n = 16) or in vitro studies (n = 12). Conclusion No in vivo studies were identified to establish the hypothetical impact preformed metal crowns would have on the diagnostic quality of an MRI in the head and neck region. Decision making needs to be guided on a case by case basis. Further high-quality clinical studies are required.

scholarly journals Analysis of the impact of the quantizer range choice on compression and quality of the reconstructed image

2013 ◽  
Vol 26 (2) ◽  
pp. 79-85
Author(s):  
Milan Savic ◽  
Zoran Peric ◽  
Nikola Simic
Keyword(s):  
Image Compression ◽  
System Performance ◽  
Lower Number ◽  
Reconstructed Image ◽  
Grayscale Image ◽  
Bit Rate ◽  
The Third ◽  
Set Up ◽  
The Impact

In this paper an algorithm for grayscale image compression based on usage of three fixed uniform quantizers designed for discrete input samples is presented. The algorithm is based on the alternating use of these three quantizers. Number of quantization levels and quantizer range size increases from the first to the third quantizer. Experimental results show that choice of the quantizer range has an impact on system performance. While selecting a range of the first two quantizers (with a lower number of quantization levels) it is necessary to make a compromise between quality and bit rate (larger quantizer range leads to lower average bit rate but the quality of reconstructed image is also lower). It is shown that the range of the third quantizer should be set up to cover as many as possible high number of input samples making sure that the overload distortion does not become dominant.

scholarly journals Art Image Compression Based on Lossless LZW Hashing Ciphering Algorithm

2021 ◽  
Vol 2114 (1) ◽  
pp. 012080
Author(s):  
Sajaa G. Mohammed ◽  
Safa S. Abdul-Jabbar ◽  
Faisel G. Mohammed
Keyword(s):  
Image Compression ◽  
Digital Images ◽  
Color Image ◽  
Research Work ◽  
Storage Space ◽  
Scalar Quantization ◽  
Low Bit Rate ◽  
The Matrix ◽  
Color Image Compression

Abstract Color image compression is a good way to encode digital images by decreasing the number of bits wanted to supply the image. The main objective is to reduce storage space, reduce transportation costs and maintain good quality. In current research work, a simple effective methodology is proposed for the purpose of compressing color art digital images and obtaining a low bit rate by compressing the matrix resulting from the scalar quantization process (reducing the number of bits from 24 to 8 bits) using displacement coding and then compressing the remainder using the Mabel ZF algorithm Welch LZW. The proposed methodology maintains the quality of the reconstructed image. Macroscopic and quantitative experimental results on technical color images show that the proposed methodology gives reconstructed images with a high PSNR value compared to standard image compression techniques.

scholarly journals QUANTITATIVE ANALYSIS OF CARDIAC PLANAR SPECT IMAGES OF 99mTC-MIBI RADIOPHARMACEUTICAL

Anales AFA ◽  
2021 ◽  
Vol 32 (2) ◽  
pp. 39-42
Author(s):  
N. Guisande ◽  
◽  
M. Pallares ◽  
S. Rozanskas ◽  
L. Quiroga ◽  
...  
Keyword(s):  
Quantitative Analysis ◽  
Diagnostic Quality ◽  
99Mtc Mibi ◽  
The Impact ◽  
Spect Images ◽  
Radioactivity Distribution

In this work 99mTc-MIBI cardiac scintigraphs are quantitively analyzed with the aim to determine the radiopharmaceutical uptake in the heart (organ of interest) and in the liver. The impact of the radioactivity distribution in the diagnostic quality of the images is discussed.

scholarly journals A Novel Optimized Golomb-Rice Technique for the Reconstruction in Lossless Compression of Digital Images

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
Shaik. Mahaboob Basha ◽  
B. C. Jinaga
Keyword(s):  
Image Compression ◽  
Digital Images ◽  
Visual Quality ◽  
Natural Images ◽  
Picture Quality ◽  
Compression Efficiency ◽  
Still Image ◽  
Efficiency Parameter ◽  
Image Compression Algorithm

The research trends that are available in the area of image compression for various imaging applications are not adequate for some of the applications. These applications require good visual quality in processing. In general the tradeoff between compression efficiency and picture quality is the most important parameter to validate the work. The existing algorithms for still image compression were developed by considering the compression efficiency parameter by giving least importance to the visual quality in processing. Hence, we proposed a novel lossless image compression algorithm based on Golomb-Rice coding which was efficiently suited for various types of digital images. Thus, in this work, we specifically address the following problem that is to maintain the compression ratio for better visual quality in the reconstruction and considerable gain in the values of peak signal-to-noise ratios (PSNR). We considered medical images, satellite extracted images, and natural images for the inspection and proposed a novel technique to increase the visual quality of the reconstructed image.

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