Synthetic CT: Simulating low dose single and dual energy protocols from a dual energy scan

Wang, Adam; Pelc, Norbert J.

doi:10.1118/1.3633895

Cited by 17 publications

(20 citation statements)

References 63 publications

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“…For the same reason, CT images of the CIRS Model 059 breast phantom structure reconstructed from direct measurements using energy of 80 keV or 140 keV, did not allow to recognize heterogeneous areas. However, inclusions in the phantom gel could be visualised on secondary reconstruction images obtained in dual-energy CT examination at the virtual energy level of 40 keV (Wang, Pelc, 2011). The visualised inclusions have sharply delineated edges but are hardly distinguishable from the phantom gel background (the contrast values between structures and the background contain in the maximum range 0÷6 dB and the average value is about 3 dB, see Table 1) even with increased image contrast (Fig.…”

Section: Computed Tomographymentioning

confidence: 99%

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Ultrasound Transmission Tomography Imaging of Structure of Breast Elastography Phantom Compared to US, CT and MRI

Opieliński

Pruchnicki

Gudra

et al. 2013

Archives of Acoustics

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The paper presents an analysis of the results of ultrasound transmission tomography (UTT) imaging of the internal structure of a breast elastography phantom used for biopsy training, and compares them with the results of CT, MRI and, conventional US imaging; the results of the phantom examination were the basis for the analysis of UTT method resolution. The obtained UTT, CT and MRI images of the CIRS Model 059 breast phantom structure show comparable (in the context of size and location) heterogeneities inside it. The UTT image of distribution of the ultrasound velocity clearly demonstrates continuous changes of density. The UTT image of derivative of attenuation coefficient in relation to frequency is better for visualising sharp edges, and the UTT image of the distribution of attenuation coefficient visualises continuous and stepped changes in an indirect way. The inclusions visualized by CT have sharply delineated edges but are hardly distinguishable from the phantom gel background even with increased image contrast. MRI images of the studied phantom relatively clearly show inclusions in the structure. Ultrasonography images do not show any diversification of the structure of the phantom. The obtained examination results indicate that, if the scanning process is accelerated, ultrasound transmission tomography method can be successfully used to detect and diagnose early breast malignant lesions. Ultrasonic transmission tomography imaging can be applied in medicine for diagnostic examination of women's breasts and similarly for X-ray computed tomography, while eliminating the need to expose patients to the harmful ionising radiation.

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Section: Computed Tomographymentioning

confidence: 99%

“…5). The CT examination was performed using a dual-energy protocol: 80 keV and 140 keV (Wang, Pelc, 2011). Next, secondary reconstructions of images for energy of 40 keV were obtained using dedicated software (GSI Viewer, GE Healthcare).…”

Section: Methodsmentioning

confidence: 99%

Ultrasound Transmission Tomography Imaging of Structure of Breast Elastography Phantom Compared to US, CT and MRI

Opieliński

Pruchnicki

Gudra

et al. 2013

Archives of Acoustics

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“…Then, the readout noise becomes significant and the measured signal is best described by compound Poisson statistics [12] [13] [14]. Still, many low--dose CT--simulators have merely added Gaussian noise to the raw projection data [8] [15] [16] [7]. Zabic et al [17] extended the noise model to correctly reflect the noise (co)variances under photon--starvation conditions and appropriately simulate detector noise artifacts.…”

Section: Related Workmentioning

confidence: 99%

Simulation of scanner- and patient-specific low-dose CT imaging from existing CT images

et al. 2017

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“…For the same reason the CT images of the CIRS Model 059 breast phantom structure reconstructed from direct measurements using energy of 80 keV or 140 keV did not allow recognition of heterogeneous areas. Inclusions in the phantom gel were only visualised on secondary reconstructions of images of dual-energy CT examination (Wang, Pelc, 2011) (energy of 40 keV). Using this method it is possible to simulate an enhanced mammographic image without the need to mechanically compress the phantom as this would cause damage.…”

Section: Measurementsmentioning

confidence: 99%

Ultrasonic Mammography with Circular Transducer Array

Opieliński¹,

Pruchnicki²,

Gudra³

2015

Archives of Acoustics

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Ultrasonic projection imaging is similar to X-ray radiography. Nowadays, ultrasonic projection methods have been developed in the set-up of multi-element flat arrays with miniature transducers, where one of the array acts as a transmitter and the other one is a receiver.In the paper, a new method of the projection imaging using a 1024-element circular ultrasonic transducer array is presented. It allows the choice of a projection scanning plane for any angle around a studied object submerged in water. Fast acquisition of measurement data is achieved as a result of parallel switching of opposite transmitting and receiving transducers in the circular array and vertical movement of the array. The algorithm equalizing the length of measurement rays and the distances between them was elaborated for the reconstruction of projection images.Projection research results of breast phantom obtained by means of the elaborated measurement setup and compared with mammography simulations (acquired through overlapping of X-ray tomographic images) show that ultrasonic projection method presented in this paper (so-called ultrasonic mammography) can be applied to the woman's breast and be used as a diagnosis for an early detection of cancerous lesions. It can, most of all, be used as an alternative or complementary method to standard mammography, which is harmful because of ionizing radiation and invasive due to the mechanical compression of tissue.

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Synthetic CT: Simulating low dose single and dual energy protocols from a dual energy scan

Cited by 17 publications

References 63 publications

Ultrasound Transmission Tomography Imaging of Structure of Breast Elastography Phantom Compared to US, CT and MRI

Ultrasound Transmission Tomography Imaging of Structure of Breast Elastography Phantom Compared to US, CT and MRI

Simulation of scanner- and patient-specific low-dose CT imaging from existing CT images

Ultrasonic Mammography with Circular Transducer Array

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