Browsing by Subject "CONSISTENCY"

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Ways of processing semantic information during different change detection tasks
    (ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD) Türkan, BN; Iyilikci, O; Amado, S
    Recent research on change blindness phenomenon revealed contradictory findings about scene-object relationship. These discrepant results might be stemming from procedure and task constraints. Therefore, we aimed to investigate the effect of the type of paradigm on change blindness phenomenon during the natural scene viewing in the frame of high-level scene perception. For this purpose, we compared two frequently used change detection tasks; flicker and one-shot paradigms. Additionally, eye movements were recorded to investigate the active attention mechanisms during the change detection performance. Our results suggested that change detection performance and eye movements varied across the different paradigms. We interpreted this result as the influence of different stimuli exposures and different interruptions on processing of visual stimuli during the detection of change. We explained the inconsistent results revealed by the previous research in terms of attention mechanisms, namely attention attraction and attention disengagement that might differ while performing the different change detection tasks.
  • No Thumbnail Available
    Item
    Does a patient-specific bladder-filling protocol affect bladder volume and dose in postprostatectomy radiotherapy?
    (SPRINGER) Yalman, D; Köylü, M; Duran, O
    PurposeOur aim is to develop a patient-specific bladder-filling protocol (PSP) using an ultrasound-based bladder scanner (BS) and compare the volumetric and dosimetric parameters with those of the standard filling protocol (SP) in postprostatectomy patients.MethodsTwenty postprostatectomy patients who received salvage radiotherapy (72 Gy/36 fx) were included. For PSP, the patient was asked to drink 500 mL of water after emptying his bladder. Bladder volume was measured using BS every 10 min. Each patient's unique time to reach a 150-200 cc volume was used for simulation and treatment. For the SP, the patient was asked about the feeling of having a full bladder. Organs at risk (OAR) were contoured on cone-beam computed tomography (CBCT) scans that were transferred to the treatment planning system (TPS). Treatment plans were applied to CBCTs. Changes in bladder volume and doses for planning computed tomography (PCT) and CBCT were determined.ResultsIn the SP, there was no significant difference in mean bladder volume for PCT and CBCT (p = 0.139); however, there was a trend for significance in the mean bladder dose (p = 0.074). In PSP, there was no significant difference in the mean bladder volume or dose for PCT and CBCT (p = 0.139 and p = 0.799, respectively). There was a significant difference in terms of mean CBCT bladder volume between the two protocols (p = 0.007), whereas no significant difference was detected in terms of bladder dose (p = 0.130).ConclusionWith PSP, optimal bladder filling was obtained and maintained throughout the whole treatment course, and it was reproducible in every fraction.