Task-based assessment on various optimization protocols of computed tomography Pulmonary Angiography examination

This prospective study was designed to assess CT performance by using the task-based image quality assessment and identify influence of iterative reconstruction (IR) algorithm, tube potential pitch factor selection on dose during Computed Tomography Pulmonary Angiography (CTPA) examination. An phantom, Catphan-600 utilized in this for assessing CTPA protocols under 128-multislice scanner (Philips Brilliance iCT, USA). The standard were altered its potential, algorithm (IR). Three different levels iDose, an IR measured study. result presented term signal noise ratio (SNR), contrast (CNR), power spectrum (NPS) target transfer function (TTF). A massive improvement CNR distortion texture observed with increasing level. Noise value reduction significantly achieved although there are no changes TTF values. alteration provides some fluctuation both NPS In conclusion, measurement performed, technique allow characterizing a type quantitative local protocols.