ELOISA MARIA MELLO SANTIAGO GEBRIM
Projetos de Pesquisa
Unidades Organizacionais
Instituto de Radiologia, Hospital das Clínicas, Faculdade de Medicina - Médico
4 resultados
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- Rhinomanometry Versus Computational Fluid Dynamics: Correlated, but Different Techniques(2021) CHEROBIN, Giancarlo B.; VOEGELS, Richard L.; PINNA, Fabio R.; GEBRIM, Eloisa M. M. S.; BAILEY, Ryan S.; GARCIA, Guilherme J. M.Background Past studies reported a low correlation between rhinomanometry and computational fluid dynamics (CFD), but the source of the discrepancy was unclear. Low correlation or lack of correlation has also been reported between subjective and objective measures of nasal patency. Objective: This study investigates (1) the correlation and agreement between nasal resistance derived from CFD (R-CFD) and rhinomanometry (R-RMN), and (2) the correlation between objective and subjective measures of nasal patency. Methods Twenty-five patients with nasal obstruction underwent anterior rhinomanometry before and after mucosal decongestion with oxymetazoline. Subjective nasal patency was assessed with a 0-10 visual analog scale (VAS). CFD simulations were performed based on computed tomography scans obtained after mucosal decongestion. To validate the CFD methods, nasal resistance was measuredin vitro(R-EXPERIMENT) by performing pressure-flow experiments in anatomically accurate plastic nasal replicas from 6 individuals. Results Mucosal decongestion was associated with a reduction in bilateral nasal resistance (0.34 +/- 0.23 Pa.s/ml to 0.19 +/- 0.24 Pa.s/ml, p = 0.003) and improved sensation of nasal airflow (bilateral VAS decreased from 5.2 +/- 1.9 to 2.6 +/- 1.9, p < 0.001). A statistically significant correlation was found between VAS in the most obstructed cavity and unilateral airflow before and after mucosal decongestion (r = -0.42, p = 0.003). Excellent correlation was found between R(CFD)and R-EXPERIMENT(r = 0.96, p < 0.001) with good agreement between the numerical andin vitrovalues (R-CFD/R-EXPERIMENT = 0.93 +/- 0.08). A weak correlation was found between R(CFD)and R-RMN(r = 0.41, p = 0.003) with CFD underpredicting nasal resistance derived from rhinomanometry (R-CFD/R-RMN = 0.65 +/- 0.63). A stronger correlation was found when unilateral airflow at a pressure drop of 75 Pa was used to compare CFD with rhinomanometry (r = 0.76, p < 0.001). Conclusion CFD and rhinomanometry are moderately correlated, but CFD underpredicts nasal resistance measuredin vivodue in part to the assumption of rigid nasal walls. Our results confirm previous reports that subjective nasal patency correlates better with unilateral than with bilateral measurements and in the context of an intervention.
- Dental findings on face and neck imaging(2021) ALVES, Isabela dos Santos; VENDRAMINI, Daniela Ferreira Vieira; LEITE, Claudia da Costa; GEBRIM, Eloisa Maria Mello Santiago; PASSOS, Ula LindosoAbstract When it is necessary to evaluate dental structures, the typical method is to obtain intraoral or panoramic X-rays at specialized dental clinics. However, in the daily practice of head and neck radiology, or even general radiology, it is common to encounter clinical situations or examination findings related to dental problems that should not be ignored. Because such problems can often be responsible for the clinical complaints of patients, this review aims to assist radiologists in identifying and describing common dental conditions on computed tomography of paranasal sinuses, face, and neck. It is important for radiologists to have knowledge of dental arch anatomy and its relationships with facial structures, as well as of major dental pathologies, including periapical sclerotic lesions, odontogenic cysts, fistulas, and abscesses, together with knowledge of incidental findings without clinical repercussions, which should be easily identified and stressed by the radiologist when necessary. The imaging methods most commonly used in evaluation of paranasal sinuses and face are computed tomography and magnetic resonance imaging. Those methods allow radiologists to recognize and become familiar with the main dental findings. The description of such findings by a radiologist can lead to a change in treatment strategy.
- Postoperative Imaging of the Temporal Bone(2021) TAMES, Hugo L. V. C.; PADULA, Mario; SARPI, Maira O.; GOMES, Regina L. E.; TOYAMA, Carlos; MURAKOSHI, Rodrigo W.; OLIVETTI, Bruno C.; GEBRIM, Eloisa M. M. S.The anatomy of the temporal bone is complex, and postoperative imaging evaluation of this bone can be challenging. Surgical approaches to the temporal bone can be categorized didactically into tympanoplasty and ossicular reconstruction, mastoidectomy, and approaches to the cerebellopontine angle and internal auditory canal (IAC). In clinical practice, different approaches can be combined for greater surgical exposure. Postoperative imaging may be required for follow-up of neoplastic lesions and to evaluate unexpected outcomes or complications of surgery. CT is the preferred modality for assessing the continuity of the reconstructed conductive mechanism, from the tympanic membrane to the oval window, with use of grafts or prostheses. It is also used to evaluate aeration of the tympanic and mastoid surgical cavities, as well as the integrity of the labyrinth, ossicular chain, and tegmen. MRI is excellent for evaluation of soft tissue. Use of a contrast-enhanced fat-suppressed MRI sequence is optimal for follow-up after IAC procedures. Non-echo-planar diffusion-weighted imaging is optimal for detection of residual or recurrent cholesteatoma.The expected imaging findings and complications of the most commonly performed surgeries involving the temporal bone are summarized in this review.
bookPart Anatomia da face(2021) ZATTAR, Luciana; GEBRIM, Eloisa Santiago