[Relationship between CT Numbers and Artifacts Obtained Using CT-based Attenuation Correction of PET/CT].

التفاصيل البيبلوغرافية
العنوان:	[Relationship between CT Numbers and Artifacts Obtained Using CT-based Attenuation Correction of PET/CT].
المؤلفون:	Watanabe Y; Graduate School of Health Sciences, Hirosaki University.; Nishidai Clinic., Hosokawa S; Graduate School of Health Sciences, Hirosaki University., Otaka Y; School of Engineering, The University of Tokyo., Takahashi Y; Graduate School of Health Sciences, Hirosaki University.
المصدر:	Nihon Hoshasen Gijutsu Gakkai zasshi [Nihon Hoshasen Gijutsu Gakkai Zasshi] 2020; Vol. 76 (9), pp. 955-962.
نوع المنشور:	Journal Article
اللغة:	Japanese
بيانات الدورية:	Publisher: Nihon Hōshasen Gijutsu Gakkai Country of Publication: Japan NLM ID: 7505722 Publication Model: Print Cited Medium: Print ISSN: 0369-4305 (Print) Linking ISSN: 03694305 NLM ISO Abbreviation: Nihon Hoshasen Gijutsu Gakkai Zasshi Subsets: MEDLINE
أسماء مطبوعة:	Original Publication: Kyoto : Nihon Hōshasen Gijutsu Gakkai
مواضيع طبية MeSH:	Artifacts* , Positron Emission Tomography Computed Tomography*, Fluorodeoxyglucose F18 ; Positron-Emission Tomography ; Tomography, X-Ray Computed
مستخلص:	Purpose: The aim of this study was to clarify the artifacts that occurred in the non-activity signal with computed tomography (CT)-based attenuation correction (CTAC) error due to image misregistration. Methods: We used a cylindrical phantom containing a test tube with a diameter of 15 mm as the non-activity signal part. Positron emission tomography (PET) images were acquired for 30 minutes using the phantom with water in the non-activity signal part and ¹⁸ F-fluoro-2-deoxy-d-glucose ( ¹⁸ F-FDG) (5.3 kBq/ml) in the background area. CT scanning was performed by replacing the water with contrast agents at different dilutions to obtain arbitrary CT numbers (-1000 to 1000). The PET images were attenuation-corrected individually by the CT images in which the CT number of the non-activity signal part had changed. The relationship between the CT numbers and the CTAC artifact was determined by measuring the PET value in the non-activity signal part of the PET images and comparing C i . Results: As the CT number of the CT images increased, C i of the artifact increased. The CT number and C i had a correlation of y=1.48x+2.86×10 ³ (R ² =0.99) when CTAC was performed in units of CT numbers above 0 for PET data of water (0 HU) and a correlation of y=3.15x+6.26×10 ³ (R ² =0.97) when CTAC was performed in units of CT numbers below 0 for PET data of air (-1000 HU). Although the original CT image was air, the artifacts due to CTAC errors with different Hounsfield units showed larger changes. In particular, positive artifacts were recognized in the PET images after CTAC depending on the Hounsfield units. Conclusions: When the CT number was different from the original in CTAC, the PET value was different. CTAC should be performed with caution as there may be image misregistration.
فهرسة مساهمة:	Keywords: CT-based attenuation correction; positron emission tomography/computed tomography (PET/CT)
المشرفين على المادة:	0Z5B2CJX4D (Fluorodeoxyglucose F18)
تواريخ الأحداث:	Date Created: 20200923 Date Completed: 20200925 Latest Revision: 20200925
رمز التحديث:	20231215
DOI:	10.6009/jjrt.2020_JSRT_76.9.955
PMID:	32963141
قاعدة البيانات:	MEDLINE

الوصف
تدمد:	0369-4305
DOI:	10.6009/jjrt.2020_JSRT_76.9.955