Photon-counting detector (PCD) CT utilizes a charged semiconductor element directly paired with a high-resolution detector panel. The direct conversion of detected photons into electrical signal represents the most recent generational advance in CT technology. Changes to detector technology achieved with PCDs has the potential to reduce image noise, improve spatial resolution, improve contrast resolution, and provide multispectral imaging capability. Importantly, these gains may be achieved with an overall decrease in radiation and iodinated contrast dose. This exhibit reviews the underlying technology of the PCD using clinical scans of pediatric patients performed on the first commercially available PCCT. We present examples of (1) PCD noise reduction capability; (2) improvements in spatial resolution; (3) improvements in contrast resolution; and (4) uses of multispectral capability. These are presented in comparison to the latest generation energy integrating detector (EID) CTs to highlight reductions in radiation dose and contrast media dose. Read More

Meeting name: SPR 2023 Annual Meeting & Postgraduate Course , 2023

Authors: Cao Joseph, El-ali Alexander, Siegel Marilyn

Keywords: photon counting, CT, ALARA

<b>Solitary epiphyseal lesions are rare in children, and no large series describes the relative frequency of different etiologies. Understanding the incidence and nature of epiphyseal lesions is critical in informing radiologists encountering these lesions. </b> Read More

Meeting name: SPR 2020 Annual Meeting & Postgraduate Course , 2020

Authors: El-ali Alexander, Coblentz Ailish, Degnan Andrew

Keywords: Bone tumor, Epiphysis, Solitary lytic lesion

Dynamic Airway CT (DACT) has risen in popularity in recent years, however, studies of Tracheobronchomalacia (TBM) are hindered by inconsistent definitions which variously rely on airway area, airway diameter, and qualitative measures. We explore the interrater reliability of these measures. Read More

Meeting name: SPR 2020 Annual Meeting & Postgraduate Course , 2020

Authors: El-ali Alexander, Davis James, Otero Hansel, Biko David, Rapp Jordan

Keywords: dynamic airway imaging, CT, tracheobronchomalacia

The aim of this report is to document the clinical presentation, multimodality imaging features, and management of patients with diffuse intra-abdominal Infantile Hemangioma (IH) and Kaposiform Hemangioendothelioma (KHE). Read More

Meeting name: SPR 2017 Annual Meeting & Categorical Course , 2017

Authors: El-ali Alexander, Vaughan Kevin, Brown Amanda, Davis Amy, Grunwaldt Lorelei, Sabri Yilmaz

Keywords: Infantile Hemangioma, Kaposiform Hemangioendothelioma, Radiologic Pathologic Correlation

Nephron sparing surgery for renal masses is indicated for pediatric patients with bilateral renal masses and masses associated with syndromic conditions predisposed to recurrence. However, there is a paucity of literature on MRI-based biomarkers in patients undergoing partial nephrectomy. Relating these imaging biomarkers to patient outcomes might inform surgical decision making and patient counseling. Read More

Meeting name: SPR 2020 Annual Meeting & Postgraduate Course , 2020

Authors: El-ali Alexander, Mittal Sameer, Boyer Kathleen, Long Christopher, States Lisa, Back Susan, Khrichenko Dmitry, Serai Suraj

Keywords: Imaging Biomarkers, MRI, Renal Tumor

There is no standardized system for assessment of which pediatric tumors are amenable to partial nephrectomy – a surgery that is considered in pediatric patients with bilateral renal masses and those with predisposition syndromes. The RENAL Nephrometry score is the most widely used system to assess renal tumor complexity for surgical decision making in adults. We evaluated the RENAL Nephrometry score and imaging features that might predict perioperative clinical outcomes. Read More

Meeting name: SPR 2020 Annual Meeting & Postgraduate Course , 2020

Authors: El-ali Alexander, Sameer Mittal, Calle Toro Juan, Shah Jay, Lawton Brendan, Kolon Thomas, Long Christopher, Back Susan

Keywords: Partial Nephrectomy, Wilms Tumor, Patient Outcomes