FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2123169536> ?p ?o ?g. }

• W2123169536 abstract "In this study we have investigated the possibilities of dose reduction in CT at a constant level of image quality by adjustment of the tube current to the phantom size. The motivation with the study is the high radiation doses to the patients and the increasing frequency of CT examinations and the variety of examinations in CT, and that the same tube current is used for different patient sizes. According to UNSCEAR (2000) the effective dose from CT examinations are in general relatively high, typically 1- 30 mSv. These doses can often approach or exceed levels known to increase the probability of cancer. The conclusion based on the results from a survey of the frequency of radiological examination in Sweden during the period 1998-99 (Leitz, 1999), is that a relatively small fraction of all examinations (11 %) gives rise to a large contribution to the collective effective dose (68 %).The aim of the study was to reduce the patient dose without reducing the image quality. This is possible with adjustment of the tube current to the patient size. To establish the relation between phantom size, image quality and dose we scanned tree different phantoms, two of these were the standard CT dosimetry phantoms (16 and 32 diameter) and the third was a similar phantom with 24 cm diameter. The scans were made on a Siemens Somatom Plus 4, with standard scan technique for abdomen. To estimate the image quality at different levels of dose, we made measurements with reduced mAs and determined the signal-to-noise ratio, SNR. Finally for the different phantom sizes, we determined the necessary dose to keep the SNR at the same level as when the body phantom was imaged with 185 mAs. The results of the study showed that the mAs settings can be reduced to about 41 mAs in the phantom with diameter 24 cm (the medium size phantom) and to 20 mAs in the 16 diameter phantom (the small phantom) and still get the same level of SNR as in the body phantom at 185 mAs. This means that by using a lower mAs setting for smaller patients a considerable dose saving can be achieved. Determinations of SNR in patient images have also been performed. Images of twenty-four patients who had a CT examination of the liver were evaluated. The result was that the dose to the patient can be reduced to half for patients weighing about 60 kg and still get the same SNR as for an 80 kg patient with the original mAs setting. With the knowledge from this study, a measuring-tape graded with mAs setting can be produced. Before examining a patient the technician would measure the circumference of the body part of interest for the patient with the mAs-tape to find what mAs setting should be used. More than a 50 percent reduction in patient dose is possible by appropriate choice of scan parameters." @default.
• W2123169536 created "2016-06-24" @default.
• W2123169536 creator A5078680577 @default.
• W2123169536 date "2003-01-01" @default.
• W2123169536 modified "2023-09-26" @default.
• W2123169536 title "Reduction of Patient Dose in CT: Adjustment of Tube Current to Patient Size" @default.
• W2123169536 cites W1646848978 @default.
• W2123169536 cites W1970476216 @default.
• W2123169536 cites W2004804713 @default.
• W2123169536 cites W2018332138 @default.
• W2123169536 cites W2571036723 @default.
• W2123169536 hasPublicationYear "2003" @default.
• W2123169536 type Work @default.
• W2123169536 sameAs 2123169536 @default.
• W2123169536 citedByCount "0" @default.
• W2123169536 crossrefType "journal-article" @default.
• W2123169536 hasAuthorship W2123169536A5078680577 @default.
• W2123169536 hasConcept C104293457 @default.
• W2123169536 hasConcept C115961682 @default.
• W2123169536 hasConcept C126838900 @default.
• W2123169536 hasConcept C149857219 @default.
• W2123169536 hasConcept C151337348 @default.
• W2123169536 hasConcept C154945302 @default.
• W2123169536 hasConcept C178451039 @default.
• W2123169536 hasConcept C2987700449 @default.
• W2123169536 hasConcept C2989005 @default.
• W2123169536 hasConcept C41008148 @default.
• W2123169536 hasConcept C55020928 @default.
• W2123169536 hasConcept C71924100 @default.
• W2123169536 hasConcept C75088862 @default.
• W2123169536 hasConceptScore W2123169536C104293457 @default.
• W2123169536 hasConceptScore W2123169536C115961682 @default.
• W2123169536 hasConceptScore W2123169536C126838900 @default.
• W2123169536 hasConceptScore W2123169536C149857219 @default.
• W2123169536 hasConceptScore W2123169536C151337348 @default.
• W2123169536 hasConceptScore W2123169536C154945302 @default.
• W2123169536 hasConceptScore W2123169536C178451039 @default.
• W2123169536 hasConceptScore W2123169536C2987700449 @default.
• W2123169536 hasConceptScore W2123169536C2989005 @default.
• W2123169536 hasConceptScore W2123169536C41008148 @default.
• W2123169536 hasConceptScore W2123169536C55020928 @default.
• W2123169536 hasConceptScore W2123169536C71924100 @default.
• W2123169536 hasConceptScore W2123169536C75088862 @default.
• W2123169536 hasLocation W21231695361 @default.
• W2123169536 hasOpenAccess W2123169536 @default.
• W2123169536 hasPrimaryLocation W21231695361 @default.
• W2123169536 hasRelatedWork W121329632 @default.
• W2123169536 hasRelatedWork W1985939449 @default.
• W2123169536 hasRelatedWork W1990667978 @default.
• W2123169536 hasRelatedWork W1992052817 @default.
• W2123169536 hasRelatedWork W2000165361 @default.
• W2123169536 hasRelatedWork W2005934523 @default.
• W2123169536 hasRelatedWork W2012408085 @default.
• W2123169536 hasRelatedWork W2048908524 @default.
• W2123169536 hasRelatedWork W2073411739 @default.
• W2123169536 hasRelatedWork W2076799621 @default.
• W2123169536 hasRelatedWork W2097718026 @default.
• W2123169536 hasRelatedWork W2123947540 @default.
• W2123169536 hasRelatedWork W2132870022 @default.
• W2123169536 hasRelatedWork W2350733346 @default.
• W2123169536 hasRelatedWork W2385647946 @default.
• W2123169536 hasRelatedWork W2762182233 @default.
• W2123169536 hasRelatedWork W2778270882 @default.
• W2123169536 hasRelatedWork W2802795036 @default.
• W2123169536 hasRelatedWork W2912040208 @default.
• W2123169536 hasRelatedWork W3122551043 @default.
• W2123169536 isParatext "false" @default.
• W2123169536 isRetracted "false" @default.
• W2123169536 magId "2123169536" @default.
• W2123169536 workType "article" @default.