The efficacy of tin-filtration for computed tomography in diagnosing urolithiasis
| Autor: | Sarah Li Hui Tan, Keat Low, Mohamed Khaldoun Badawy, Kenneth K. Lau, Peter Kutschera, Michal Schneider |
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| Rok vydání: | 2019 |
| Předmět: |
Male
Radiation-Protective Agents Computed tomography Signal-To-Noise Ratio Radiation Dosage Body weight 030218 nuclear medicine & medical imaging 03 medical and health sciences Radiation Protection 0302 clinical medicine Urolithiasis Radiologists medicine Humans Radiology Nuclear Medicine and imaging In patient Observer Variation medicine.diagnostic_test business.industry Radiation dose Urography Middle Aged equipment and supplies Tin 030220 oncology & carcinogenesis Radiographic Image Interpretation Computer-Assisted Female Patient dose Tomography X-Ray Computed Nuclear medicine business |
| Zdroj: | Clinical Imaging. 55:126-131 |
| ISSN: | 0899-7071 |
| DOI: | 10.1016/j.clinimag.2019.02.011 |
| Popis: | The purpose of this study was to evaluate the radiation dose and image quality of computed tomography urograms (CTU) using tin-filtration compared to conventional CTU (without tin-filtration) examinations in patients with suspected urolithiasis.Group 1 consisted of 100 patients who were examined using the tin-filtered CTU protocols (Sn100kVp or Sn150kVp); Group 2 consisted of 100 patients who were examined using the same protocols but without tin-filtration (GE-NI41 or GE-NI43). The scanning protocol was based on the patients' body weight (80 kg and ≥80 kg). The effective doses of all scans were compared between the two groups. Subjective image quality was evaluated by two blinded radiologists. The objective image quality was assessed for noise, signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR) and figure-of-merit (FOM) using the CTU scans acquired from both the tin-filtered and non-tin-filtered protocols.Tin-filtration resulted in the reduction of effective radiation dose ranging between 72% to 88% for the ≥80 kg and80 kg patient groups respectively. For both groups, tin-filtration resulted in no significant differences in SNR and a significant increase in FOM. For the80 kg group, tin-filtration resulted in significantly noisier images but with no significant difference in CNR. For the ≥80 kg group, tin-filtration resulted in significantly higher CNR. There was no significant difference in subjective image quality when assessed by the radiologists in terms of diagnostic confidence for urolithiasis.Tin-filtration significantly reduces patient dose while maintaining diagnostic image quality of CTUs for patients with suspected urolithiasis. |
| Databáze: | OpenAIRE |
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