Essays about: "Contrast-to-Noise Ratio CNR"

Showing result 1 - 5 of 11 essays containing the words Contrast-to-Noise Ratio CNR.

  1. 1. Development of Advanced X-ray Micro-Tomography Helical Scan andTomographic Data Processing

    University essay from Högskolan i Gävle/Avdelningen för elektroteknik, matematik och naturvetenskap

    Author : Yoseph Abraham; [2023]
    Keywords : ;

    Abstract : Micro-computed tomography (Micro-CT) is an imaging technique that allows for high-resolution,three-dimensional (3D) internal visualization of small objects in a non-destructive manner. However,a significant limitation arises when attempting to image elongated samples at higher resolutions andmagnifications due to the inherently small field of view (FOV). READ MORE

  3. 2. 3D printer in dosimetry and mammography – designing and testing an OSL dosemeter holder and a low contrast-detail phantom

    University essay from Lunds universitet/Sjukhusfysikerutbildningen

    Author : Måns Boll; [2022]
    Keywords : Medicine and Health Sciences;

    Abstract : Introduction: Today, 3D printing is a versatile tool used in a wide range of fields. With the advent of more cost-effective fused deposition modelling (FDM) 3D printing technologies it is time to investi- gate what such a 3D printer has to offer in radiation science applications. READ MORE

  4. 3. Implementation and verification of a quantitative MRI method for creating and evaluating synthetic MR images

    University essay from Karlstads universitet/Institutionen för ingenjörsvetenskap och fysik (from 2013)

    Author : Aleksander Blagoiev; [2020]
    Keywords : MRI; Quantitative MRI; Synthetic MRI;

    Abstract : The purpose of this thesis was to implement and quantitatively test a quantitative MRI (qMRI) method, from which synthetic MR images are created and also evaluated. The parameter maps of T1, T2*, and effective proton density (PD*) were tested with reference tubes containing different relaxation times, and concentrations of water (H2O) and heavy water (D2O). READ MORE

  5. 4. Development of a Tool for Imaging the Pumping-Out Behavior of Poly- Vinyl Alcohol Shelled Microbubbles

    University essay from KTH/Skolan för kemi, bioteknologi och hälsa (CBH)

    Author : Stina Hägglund; [2020]
    Keywords : Microbubbles; Pumping-out behavior; Verasonics; Ultrasound; Ultrafast imaging;

    Abstract : For many years, microbubbles have been used as ultrasound contrast agents to improve the quality of diagnostics, seeing that they produce more backscattering ultrasound than blood does. Novel types of microbubbles and increased knowledge about their different behaviors have led to other suggested areas of use. READ MORE

  6. 5. Estimation of Noise and Contrast for CTA of the Brain

    University essay from KTH/Skolan för kemi, bioteknologi och hälsa (CBH)

    Author : Johannes Loberg; Miranda Gisudden; [2018]
    Keywords : CT - Computed Tomography - CTA- Computed Tomography Angiography - Photon Counting - CNR - Contrast to noise;

    Abstract : Computed tomography angiography (CTA) of the brain poses challenges on the imaging system; the contrast between blood vessels and surrounding soft tissue is very low, and to render small intricate vessel structures high spatial resolution is needed. Higher precision angiography would facilitate more accurate diagnosis of pathological conditions. READ MORE