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Open access

Andrzej Miśkiewicz, Tomira Rogala, Teresa Rościszewska, Tomasz Rudzki and Tadeusz Fidecki

Abstract

The purpose of the study was to compare auditory judgments of sound clarity of music examples recorded in a concert hall with predictions of clarity made from the impulse response signal recorded in the same hall. Auditory judgments were made with the use of two methods: by rating sound clarity on a numerical scale with two endpoints, and by absolute magnitude estimation. Results obtained by both methods were then compared against the values of clarity indices, C 80 and C 50, determined from the impulse response of the concert hall, measured in places in which the microphone was located during recording of music examples. Results show that auditory judgments of sound clarity and predictions made from the C 80 index yield a similar rank order of data, but the relation between the C 80 scale and perceived sound clarity is nonlinear. The data also show that the values of C 80 and C 50 indices are in very close agreement.

Open access

Justyna Szumilo, Anna Ostrowska, Malgorzata Zdunek, Slawomir Rudzki, Tomasz Chroscicki, Elzbieta Czekajska-Chehab and Franciszek Burdan

Abstract

Littoral cell angioma is a rare primary, vascular tumor thought to originate from the endothelial cells lining the sinuses of the splenic red pulp (the “littoral cells”). It is a benign, usually asymptomatic lesion diagnosed incidentally. Ultrasound and tomography appearance is not characteristic and histopathological examination is required. This work provides a case-study of littoral cell angioma which was seen in a 55-year-old female who complained of non-specific upper abdominal pain. Computed tomography revealed multiple hypo-attenuated splenic lesions suggestive for metastasis. A splenectomy was performed and routine microscopic examination supported by immunohistochemistry reactions with CD68, CD34 and CD31 showed littoral cell angioma.