J. Montoya
Mayo Clinic
Imaging phantomOpticsPhysicsBiomedical engineeringIterative reconstructionPixelMaterials scienceImage resolutionLithotripsyNodule (medicine)ScannerPhoton countingNuclear medicineRenal stoneDual energy ctComputer scienceNoise (electronics)HistogramResolution (electron density)MedicineFragility
11Publications
4H-index
49Citations
Publications 11
Newest
#1Wei Zhou (Mayo Clinic)H-Index: 13
#2J. Montoya (Mayo Clinic)H-Index: 4
Last. Shuai Leng (Mayo Clinic)H-Index: 53
view all 8 authors...
An ultra-high resolution (UHR) mode, with a detector pixel size of 0.25 mm×0.25 mm relative to isocenter, has been implemented on a whole body research photon-counting detector (PCD) computed tomography (CT) system. Twenty synthetic lung nodules were scanned using UHR and conventional resolution (macro) modes and reconstructed with medium and very sharp kernels. Linear regression was used to compare measured nodule volumes from CT images to reference volumes. The full-width-at-half-maximum of th...
11 CitationsSource
#1Alice E. Huang (Mayo Clinic)H-Index: 3
#2J. Montoya (Mayo Clinic)H-Index: 4
Last. Cynthia H. McCollough (Mayo Clinic)H-Index: 76
view all 5 authors...
OBJECTIVE. The objective of this prospective study is to evaluate the consistency of renal stone volume estimation using dual-energy CT across scanner model and reconstruction algorithm configurations. SUBJECTS AND METHODS. Patients underwent scanning with routine kidney stone composition protocols on both second- and third-generation dual-source CT scanners. Images were reconstructed using filtered back projection and iterative reconstruction (IR). In addition, a modified IR kernel on the third...
4 CitationsSource
#1J. Montoya (Mayo Clinic)H-Index: 4
#2Laurence J. EckelH-Index: 16
Last. Joel G. Fletcher (Mayo Clinic)H-Index: 84
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BACKGROUND AND PURPOSE: Given the positive impact of early intervention for craniosynostosis, CT is often performed for evaluation but radiation dosage remains a concern. We evaluated the potential for substantial radiation dose reduction in pediatric patients with suspected craniosynostosis. MATERIALS AND METHODS: CT projection data from pediatric patients undergoing head CT for suspected craniosynostosis were archived. Simulated lower-dose CT images corresponding to 25%, 10%, and 2% of the app...
13 CitationsSource
#1Wei Zhou (Mayo Clinic)H-Index: 13
#2J. Montoya (Mayo Clinic)H-Index: 4
Last. Shuai Leng (Mayo Clinic)H-Index: 53
view all 8 authors...
A new ultra high-resolution (UHR) mode has been implemented on a whole body photon counting-detector (PCD) CT system. The UHR mode has a pixel size of 0.25 mm by 0.25 mm at the iso-center, while the conventional (macro) mode is limited to 0.5 mm by 0.5 mm. A set of synthetic lung nodules (two shapes, five sizes, and two radio-densities) was scanned using both the UHR and macro modes and reconstructed with 2 reconstruction kernels (4 sets of images in total). Linear regression analysis was perfor...
2 CitationsSource
#1Andrea Ferrero (Mayo Clinic)H-Index: 8
#2Ralf Gutjahr (TUM: Technische Universität München)H-Index: 7
Last. C McCollough (Mayo Clinic)H-Index: 5
view all 10 authors...
In addition to the standard-resolution (SR) acquisition mode, a high-resolution (HR) mode is available on a research photon-counting-detector (PCD) whole-body CT system. In the HR mode each detector consists of a 2x2 array of 0.225 mm x 0.225 mm subpixel elements. This is in contrast to the SR mode that consists of a 4x4 array of the same subelements, and results in 0.25 mm isotropic resolution at iso-center for the HR mode. In this study, we quantified ex vivo the capabilities of the HR mode to...
4 CitationsSource
#1Shuai Leng (Mayo Clinic)H-Index: 53
#2Ralf Gutjahr (TUM: Technische Universität München)H-Index: 7
Last. C McCollough (Mayo Clinic)H-Index: 5
view all 9 authors...
Two ultra-high-resolution (UHR) imaging modes, each with two energy thresholds, were implemented on a research, whole-body photon-counting-detector (PCD) CT scanner, referred to as sharp and UHR, respectively. The UHR mode has a pixel size of 0.25 mm at iso-center for both energy thresholds, with a collimation of 32 × 0.25 mm. The sharp mode has a 0.25 mm pixel for the low-energy threshold and 0.5 mm for the high-energy threshold, with a collimation of 48 × 0.25 mm. Kidney stones with mixed mine...
17 CitationsSource
#1Andrea FerreroH-Index: 8
#2J. MontoyaH-Index: 4
Last. Cynthia H. McColloughH-Index: 76
view all 8 authors...
#1Andrea Ferrero (Mayo Clinic)H-Index: 8
#2J. Montoya (Mayo Clinic)H-Index: 4
Last. Cynthia H. McCollough (Mayo Clinic)H-Index: 76
view all 8 authors...
Rationale and Objectives Previous studies have demonstrated a qualitative relationship between stone fragility and internal stone morphology. The goal of this study was to quantify morphologic features from dual-energy computed tomography (CT) images and assess their relationship to stone fragility. Materials and Methods Thirty-three calcified urinary stones were scanned with micro-CT. Next, they were placed within torso-shaped water phantoms and scanned with the dual-energy CT stone composition...
8 CitationsSource
#1Shuai LengH-Index: 53
#2Alice HuangH-Index: 1
Last. Cynthia H. McColloughH-Index: 76
view all 6 authors...
#1J. Montoya (Mayo Clinic)H-Index: 4
#2Andrea Ferrero (Mayo Clinic)H-Index: 8
Last. C McCollough (Mayo Clinic)H-Index: 5
view all 5 authors...
Purpose: To investigate the noise and spatial resolution properties of virtual non-contrast (VNC) dual-energy CT images compared to true non-contrast (TNC) images across multiple patient sizes and CT systems. Methods: Torso-shaped water phantoms with lateral widths of 25, 30, 35, 40 and 45 cm and a high resolution bar pattern phantom (Catphan CTP528) were scanned using 2nd and 3rd generation dual-source CT systems (Scanner A: Somatom Definition Flash, Scanner B: Somatom Force, Siemens Healthcare...
2 CitationsSource