| Experimental Study and Optimization of Scan Parameters That Influence Radiation Dose in Temporal Bone High-Resolution Multidetector Row CT. | |
| | |
MedLine Citation:
|
PMID: 21852373 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
|
BACKGROUND AND PURPOSE: MDCT has some specific scan parameters that may systematically increase or decrease radiation dose to patients. This study explored the scan protocol parameters that impact radiation dose in temporal bone MDCT and determined the optimal scan parameters that balance radiation dose with diagnostic image quality. MATERIALS AND METHODS: Using exsomatized cadaveric heads, traditional axial scanning, and helical scanning were performed with different detector collimations. Helical scans of the same scan region were then acquired by using the determined optimal detector collimation and various tube voltages, whereas other scan parameters remained fixed. Next, the scans were repeated by using various tube current-time products by using the determined optimal tube voltage. Last, with fixed tube current-time product, the scans were repeated with various pitches. All thin-section, helically acquired scans were reformatted to axial and coronal images with respect to the relevant scanning baseline. In each of the image volumes, the mean and SD HU values in regions of interest were measured in the central section of the internal auditory canal, and CNR values were calculated. RESULTS: In agreement with theory, wider detector collimations such as 16 × 0.625 mm and 64 × 0.625 mm were associated with lower radiation doses than narrower collimations due to their lower overbeaming and higher geometric efficiency. In helical scanning, the detector collimation of 16 × 0.625 mm had higher image quality and the minimum DLP. Axial and coronal images acquired by using a 140-kVp tube voltage had significantly lower noise than scans acquired at 120 or 80 kVp with equivalent volume CT dose index. Diagnostic image quality was achieved when using a minimum tube current-time product of 120 mAs. Noise, CNR, and dose were jointly optimized with a pitch of 0.685. CONCLUSIONS: Temporal bone CT scanning parameters may be optimized by following a systematic procedure that allows for the optimization of diagnostic image quality and the minimization of radiation dose. One such procedure for a particular 64-section MDCT scanner has been presented. |
| | |
Authors:
|
Y T Niu; M E Olszewski; Y X Zhang; Y F Liu; J F Xian; Z C Wang |
Related Documents
:
|
11743533 - Computed tomography evaluation of shoulder prosthesis retroversion. 11541123 - Homochirality as the signature of life: the seth cigar. 16554583 - Cecal mobility: a potential pitfall of ct colonography. |
Publication Detail:
|
Type: JOURNAL ARTICLE Date: 2011-8-18 |
Journal Detail:
|
Title: AJNR. American journal of neuroradiology Volume: - ISSN: 1936-959X ISO Abbreviation: - Publication Date: 2011 Aug |
Date Detail:
|
Created Date: 2011-8-19 Completed Date: - Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 8003708 Medline TA: AJNR Am J Neuroradiol Country: - |
Other Details:
|
Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
|
Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing, China; and Philips Healthcare, Cleveland, Ohio. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: A Flow-Diverting Stent Is Not a Pressure-Diverting Stent.
Next Document: High-Resolution Double Inversion Recovery Black-Blood Imaging of Cervical Artery Dissection Using 3T...