Browsing by Author "Rojas, R."

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    Normal-Mode Theory for Cylinder Arrays
    (2000) Rojas, R.; Claro Huneeus, Francisco
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    Rathke’s cleft cyst infections and pituitary abscesses: case series and review of the literature
    (Springer, 2021) Aranda, F.; García, R.; Guarda, F.J.; Nilo, F.; Cruz, J.P.; Callejas, C.; Balcells Marty, María Elvira; González, G.; Rojas, R.; Villanueva, P.
    Purpose: Pituitary abscesses (PAs) are a rare clinical entity which may arise from normal pituitary tissue or underlying lesions within the gland. Rathke’s cleft cysts (RCCs) are not commonly associated with the development of PA. Methods: Retrospective chart review of three patients with PAs within RCCs at a single university center and review of the literature. Results: Three cases are reported. The first case presented with fever and headache and a history of prior surgery due to RCC and a recent respiratory tract infection. The second case had a history of recent skin infections and presented with sudden onset headache and hypopituitarism. In the third case, chronic visual field impairment prompted an ophthalmologic evaluation resulting in a diagnosis of an adenoma and an infected RCC. In all three cases, an endoscopic endonasal approach was performed to drain infected tissue and allowed microbiological identification of gram-positive cocci, followed by treatment with antibiotics for at least three weeks. Cases in the literature are scarce and the diagnosis is usually made intraoperatively due to non-specific manifestations and imaging. PAs arising from underlying pituitary lesions are less common than primary PAs. Differential diagnosis should include pituitary apoplexy, hypophysitis and other cystic lesions. Conclusion: PAs occurring in RCCs are infrequent. Clinical manifestations are commonly subacute, without septic symptoms. Imaging is usually non-specific. Preoperative diagnosis is infrequent and a broad differential diagnosis should be considered. Empirical antimicrobial therapy should be initiated and adjusted after obtaining cultures to reduce the rate of recurrence and improve clinical outcomes.
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    VerDAQ: a Versatile Data AcQuisition system for high energy physics experiments
    (2022) Rojas, R.; Kuleshov, S., V; Silva, C.; Carvajal, G.; Abusleme, A.; Hakobyan, H.; Arredondo, V; Gonzalez, J.
    The Versatile Data AcQuisition (VerDAQ) system is a modular and flexible data ac-quisition platform designed to be used in a wide range of high-energy physics experiments, from small desktop detectors to large experiments in accelerators. The main characteristic of VerDAQ is its flexibility that stems from a modular design, separating the front-end electronics in a mezza-nine board from the back-end electronics on a motherboard. The latter includes a programmable System-on-Chip (SoC) that provides preprocessing and communication capabilities. The VerDAQ system is hardware and firmware reconfigurable, enabling its use in standalone instruments as well as integrated into extensive data acquisition systems. In this paper, the system structure is described in detail, and a particular implementation of a laboratory prototype using the DRS4 chip is characterized and used to demonstrate standalone operation.