Background: Positron Emission Tomography-Computed Tomography (PET-CT) is a useful hybrid imaging modality in the diagnosis of various malignancies. This modality imposes almost 20 mSv radiation dose to the patient. The purpose of the present study was to evaluate the uncertainties in calculated CT effective dose in TUBE CURRENT MODULATION-activated scans by Impact-Dose software.  Materials and ...

Introduction: Recent studies of Computed Tomography (CT) conducted on patient dose reduction have recommended using an iterative reconstruction algorithm and mA (mili-Ampere) dose modulation. The current study aimed to evaluate Iterative Dose Reduction Algorithm (IDREAM) as an iterative reconstruction algorithm. Material and Methods: Two CT p...

We introduce a value-based noise reduction method for Dual-Energy CT applications. It is based on joint intensity statistics estimated from high- and low-energy CT scans of the identical anatomy in order to reduce the noise level in both scans. For a given pair of measurement values, a local gradient ascension algorithm in the probability space is used to provide a noise reduced estimate. As a ...

OBJECTIVE: The purpose of the current study was to evaluate the effect of an iterative reconstruction algorithm named advanced modeled iterative reconstruction (ADMIRE) on improving image quality and reducing the radiation dose. MATERIALS AND METHODS: The Catphan phantom (Phantom Lab, USA) was scanned on a SOMATOM Force CT scanner (Siemens Healthcare, Forchheim, Germany) with different exposure...

BACKGROUND To study dose reduction using iterative reconstruction (IR) for pediatric great vessel stent computed tomography (CT). METHODS Five different great vessel stents were separately placed in a gel-containing plastic holder within an anthropomorphic chest phantom. The stent lumen was filled with diluted contrast gel. CT acquisitions were performed at routine dose, 52% and 81% reduced d...

Previous studies have shown that collegiate level music students are exposed to potentially hazardous sound levels. Compared to professional musicians, collegiate level music students typically do not perform as frequently, but they are exposed to intense sounds during practice and rehearsal sessions. The purpose of the study was to determine the full-day exposure dose including individual prac...

PURPOSE To evaluate dose reduction and image quality of abdominopelvic computed tomography (CT) reconstructed with model-based iterative reconstruction (MBIR) compared to adaptive statistical iterative reconstruction (ASIR). MATERIALS AND METHODS In this prospective study, 85 patients underwent referential-, low-, and ultralow-dose unenhanced abdominopelvic CT. Images were reconstructed with ...

This article discusses CT radiation dose, the measurement of CT dose, and CT image quality. The most commonly used dose descriptor is CT dose index, which represents the dose to a location (e.g., depth) in a scanned volume from a complete series of slices. A weighted average of the CT dose index measured at the center and periphery of dose phantoms provides a convenient single-number estimate o...

Gürültü kirliliği günümüzde çözüm bekleyen en önemli çevre sorunlarından biridir. Bu nedenle bu çalışmada toplumun yoğun olarak kullandığı alanlardan biri olan hastane ortamındaki gürültü seviyesi ve dozunun belirlenmesi amacıyla KSÜ Tıp Fakültesi Hastanesi poliklinik koridorlarında ölçümü yapılmıştır. Toplam 10 koridoru bulunan hastanenin tüm Pazartesiden Cumaya kadar 08:00-09:07, 10:00-11:01,...