دورية أكاديمية
To shield or not to shield: shielding may have unintended effects on patient dose in CT.
| العنوان: | To shield or not to shield: shielding may have unintended effects on patient dose in CT. |
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| المؤلفون: | Larjava HRS; Department of Medical Physics, Turku University Hospital and University of Turku, Turku, Finland. heli.larjava@varha.fi., Eneh CTM; Department of Medical Physics, Turku University Hospital, Turku, Finland., Niiniviita HM; Department of Medical Physics, Turku University Hospital and University of Turku, Turku, Finland. |
| المصدر: | European radiology [Eur Radiol] 2024 Apr; Vol. 34 (4), pp. 2480-2486. Date of Electronic Publication: 2023 Sep 14. |
| نوع المنشور: | Journal Article |
| اللغة: | English |
| بيانات الدورية: | Publisher: Springer International Country of Publication: Germany NLM ID: 9114774 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1432-1084 (Electronic) Linking ISSN: 09387994 NLM ISO Abbreviation: Eur Radiol Subsets: MEDLINE |
| أسماء مطبوعة: | Original Publication: Berlin : Springer International, c1991- |
| مواضيع طبية MeSH: | Tomography, X-Ray Computed*/methods , Thorax*, Humans ; Radiation Dosage ; Tomography Scanners, X-Ray Computed ; Phantoms, Imaging |
| مستخلص: | Objectives: The aim of the patient out-of-plane shield is to reduce the patient radiation dose. Its effect on tube current modulation was evaluated with the out-of-plane shield visible in the localizer but absent in the scan range in chest CT with different CT scanners. Methods: An anthropomorphic phantom was scanned with six different CT scanners from three different vendors. The chest was first scanned without any shielding, and then with the out-of-plane shield within the localizer but outside the imaged volume. All pitch values of each scanner were used. The tube current values with and without the out-of-plane shield were collected and used to evaluate the effect of overscanning and tube current modulation (TCM) on patient radiation dose. Results: The highest increase in cumulative mA was 217%, when the pitch was 1.531. The tube current value increased already 8.9 cm before the end of the scanned anatomy and the difference between the tube current of the last slices (with and without the out-of-plane shield in the localizer) was 976%. Conclusion: Applying an out-of-plane shield outside the scanned volume but visible in the localizer images may increase the patient dose considerably if the scanner's TCM function is based only on localizer images. Clinical Relevance Statement: The use of an out-of-plane shield in CT may strongly increase the tube current modulation and thus provide the patient with a higher radiation dose. Key Points: • Applying an out-of-plane shield outside the scanned volume but visible in the localizer images may increase patient radiation dose considerably. • The effect is visible with scanners that use solely localizer-based tube current modulation. • Features like overscanning may be difficult for the user to notice when planning the scanning, and yet they may affect tube current modulation and through it to patient dose. (© 2023. The Author(s).) |
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| فهرسة مساهمة: | Keywords: Chest; Computed tomography; Phantom; Radiation dose |
| تواريخ الأحداث: | Date Created: 20230914 Date Completed: 20240322 Latest Revision: 20240409 |
| رمز التحديث: | 20240409 |
| مُعرف محوري في PubMed: | PMC10957666 |
| DOI: | 10.1007/s00330-023-10211-3 |
| PMID: | 37707547 |
| قاعدة البيانات: | MEDLINE |
Find this article in full text from Springer Verlag. 
Full Text Finder | تدمد: | 1432-1084 |
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| DOI: | 10.1007/s00330-023-10211-3 |