Digital Mammography | Radiology
In digital mammography, the processes of image acquisition, display, and storage are separated, which allows optimization of each. Radiation transmitted through the breast is …
Quantitative assessment of signal and noise properties of mammography …
Siemens Opdima is a small field digital mammography system, while the other DR units are full field digital mammography systems. Signal transfer property (STP) and noise component analysis ... Monte Carlo simulation of X-ray spectra in mammography and contrast-enhanced digital mammography using the Code PENELOPE. IEEE Trans. Nucl. Sci., 2 (2013
Optimization of x-ray spectra in digital mammography …
In this work, a Monte Carlo code was used to investigate the performance of different x-ray spectra in digital mammography, through a figure of merit (FOM), defined as, with CNR being the contrast-to-noise ratio in image and being the average glandular dose. The FOM was studied for breasts with different thicknesses t (2 cm ≤t ≤ 8 cm) and glandular contents …
Full breast digital mammography with an amorphous silicon …
The physical characteristics of a clinical prototype amorphous silicon-based flat panel imager for full-breast digital mammography have been investigated. The imager employs a thin thallium …
Technique Optimization in Digital Mammography
X-RAY BEAM SPECTRUM-beam current x time (mAs) 2. EXPOSURE LEVEL - target material - filter material and thickness - tube kilovoltage (kVp) ... Digital Mammography: Performance Considerations and Current Detector Designs, Acad Radiol 3:429-437 (1996) 52. 52. SAM Question #2. The technique factor that has the strongest impact on digital ...
Comparison of spectra and mean glandular dose (MGD) …
Mammography has a crucial role in breast cancer detection. The National Cancer Institute (INCA) estimates that 29.7% of the cancer cases in Brazil are related specifically to the breast. It is necessary to evaluate the mean glandular dose with a new solid-state detector in a digital radiography syst …
Noise power spectra of images from digital mammography …
Measurements of the NPS of two detectors for digital mammography show that for these systems, 1D spectra useful for the purpose of detective quantum efficiency calculation may be obtained from thin cuts through the central portion of the calculated 2D NPS. Noise characterization through estimation of the noise power spectrum (NPS) is a central component …
Power spectrum analysis of the x-ray scatter signal in mammography …
For the mammography image acquisition simulation, which also represents the 0° breast tomosynthesis projection simulation, the x-ray source was located with the central ray normal to the detector, at the centerline of the detector. ... " Spectral analysis of full field digital mammography data," Med. Phys. 29, 647–661 (2002). 10.1118/1. ...
X-ray spectrum optimization of full-field digital …
In this paper we measure the image quality by a physical quantity, the signal difference-to-noise ratio (SDNR), and the patient risk by the average glandular dose (AGD).
Performance evaluation of six digital mammography systems
Mammography is a technically demanding radiographic modality, requiring high spatial resolution, excellent low contrast discrimination and wide dynamic range, which poses a tremendous challenge to the imaging performance of digital mammography detectors (Karellas and Vedantham, 2012).Performance evaluation is based on rigorous analysis of signal and …
Medical X-Ray Detector for Mammography and Radiology
Both the tube spectrum and the peak potential (kVp) are important parameters affecting the image quality in film-screen and digital mammography. Automatic selection of proper target/filter combination in modern mammography systems may be affected by improper kVp.
(PDF) Image Quality and Radiation Dose for Fibrofatty Breast …
In this work, a Monte Carlo code was used to investigate the performance of different x-ray spectra in digital mammography, through a figure of merit (FOM), defined as FOM = CNR²/(¯)D(g), with ...
Generation and analysis of clinically relevant breast imaging …
Purpose: The purpose of this work was to develop and make available x-ray spectra for some of the most widely used digital mammography (DM), breast tomosynthesis (BT), and breast CT …
Retrospective Comparison of Contrast-Enhanced Spectral Mammography …
The objective of our study was to evaluate the relevance of contrast-enhanced spectral mammography (CESM) in comparison with conventional digital mammography (MG) in assessing the size of a neoplastic tumor by comparing the size of the neoplastic lesion estimated on MG and CESM with the size of this lesion measured in postoperative ...
Generation and analysis of clinically relevant breast imaging …
The Monte Carlo N‐Particle radiation transport code (MCNP6) was used to generate x‐ray spectra for four commercial digital mammography (DM) systems, two commercial digital breast …
Comparison of contrast-enhanced digital mammography …
The weighting factor ω was calculated using an analytical model that simulates the imaging system and the breast. The x-ray spectra were generated at 26 to 33 kVp and 49 kVp using the tungsten anode spectral model developed by Boone et al. 57, 58 and filtered by 50-μ m Rh for LE x-rays and 237-μ m Cu for HE x-rays. The breast was simulated as a homogenous object …
Determination of transmission curves of X-ray spectra for …
In this work, the Monte Carlo (MC) code PENELOPE was employed for simulation of x-ray spectra in mammography and contrast-enhanced digital mammography (CEDM). Spectra for Mo, Rh and W anodes were ...
Multi-modal classification of breast cancer lesions in Digital
DOI: 10.1016/jpbiomed.2024.109266 Corpus ID: 273368835; Multi-modal classification of breast cancer lesions in Digital Mammography and contrast enhanced spectral mammography images
Optimization of x-ray spectra in digital mammography …
In digital mammography, the influence of x-ray spectra on image quality and dose to the breast has been studied using theoretical or experimental methods. Concerning the theoretical works, Fahrig and Yaffe (1994a, 1994b) developed an analytical model to study spectra optimization in digital mammography.
Dynamic range requirements in digital mammography
On the basis of dynamic range, W spectra are preferable for digital mammography, since Mo spectra yielding the same signal-to-noise ratio require a detector with dynamic range twice as large, and with a 30% greater saturation signal. When no scatter rejection method is used, scattered radiation over a 254 cm2 imaging field reduces the number of ...
Experimental evaluation of the image quality and dose in digital …
In this work, we studied experimentally the influence of x-ray spectrum on the contrast-to-noise ratio (CNR) and the average glandular dose (MDG) for two digital mammography systems: Senographe 2000D (GE Medical Systems) and Lorad Selenia (Hologic), with indirect and direct detector imaging technology, respectively.
Monte Carlo derivation of filtered tungsten anode X-ray …
Derive filtered tungsten X-ray spectra used in digital mammography systems by means of Monte Carlo simulations. Filtered spectra for rhodium filter were obtained for tube potentials between …
Optimization of x-ray spectra in digital mammography …
In this work, a Monte Carlo code was used to investigate the performance of different x-ray spectra in digital mammography, through a figure of merit (FOM), defined as …
Optimization of Tungsten X-Ray Spectra for …
Tungsten (W) target x-rays tubes are being studied for use in digital mammography to improve x-ray flux, reduce noise and increase tube heat capacity. A parametric model was developed for...
Mammographic equipment and its advancement | PPT
The document then covers recent advancements, such as digital mammography technologies like computed radiography, full-field digital mammography, and digital breast tomosynthesis, which uses 3D imaging to improve cancer detection rates. Read less. Read more. ... resulting in high quantum efficiency for the full energy spectrum used in mammography.
Contrast Enhanced Spectral Mammography: A Review
Contrast-enhanced spectral mammography (CESM) provides low-energy 2D mammographic images comparable to standard digital mammography and a post-contrast recombined image to assess tumor neovascularity similar to magnetic resonance imaging (MRI). The utilization of CESM in the United States is current …
Digital Mammography: From Physical Performance …
Key words: Digital X-ray detectors, Physical Performance, Modulation Transfer Function, Noise Power Spectrum, Mammography, Image Quality Introduction Medical X-ray imaging is used to provide useful information about specific aspects of human body structure or function. The quality of a radiograph needs to be
The Physics and Technology of Mammography
The ideal or "perfect" x-ray spectrum for mammography would be made up of photons all having the same energy (mono-energetic) and with the ability to adjust the energy for different breast conditions. ... Digital mammography offers …
Physical characteristics of a full-field digital mammography …
The physical performance characteristics of a flat-panel clinical full-field digital mammography (FFDM) system were investigated for a variety of mammographic X-ray …
Influence of Incident Mammography Spectra and Breast …
The aim of this work is to evaluate the effect of incident mammography spectra and breast phantom characteristics on the extracted mammography features. For this purpose, four digital breast phantoms were generated by using a dedicated in-house developed software...