{"corpus_id":26046178,"paper_sha":"e67e24d7f602c20d7f315af13279fc5f36ae8ae0","doi":"10.4329/wjr.v5.i9.334","arxiv_id":null,"pmid":24198912,"pmcid":"PMC3817292","mag_id":2001853910,"dblp_id":null,"acl_id":null,"title":"Impact of field strength and RF excitation on abdominal diffusion-weighted magnetic resonance imaging.","year":2013,"publication_date":"2013-09-28","venue":"World Journal of Radiology","journal":{"name":"World journal of radiology","pages":"\n          334-44\n        ","volume":"5 9"},"journal_issn":null,"journal_title":null,"publication_types":["JournalArticle"],"pubmed_pub_types":["Journal Article"],"s2_fields_of_study":["Medicine","Engineering"],"reference_count":35,"citation_count":8,"influential_citation_count":0,"is_open_access":false,"arxiv_categories":null,"arxiv_license":null,"arxiv_journal_ref":null,"mesh_headings":null,"chemicals":null,"comments_corrections":null,"source_flags":5,"s2_open_access_pdf_url":null,"s2_open_access_landing_url":null,"s2_open_access_license":null,"s2_open_access_status":null,"pmc_open_access_pdf_url":null,"pmc_open_access_landing_url":null,"pmc_open_access_license":null,"pmc_open_access_status":null,"unpaywall_open_access_pdf_url":null,"unpaywall_open_access_landing_url":null,"unpaywall_open_access_license":null,"unpaywall_open_access_status":null,"abstract":"AIM\nTo retrospectively and prospectively compare diffusion-weighted (DW) images in the abdomen in a 1.5T system and 3.0T systems with and without two-channel functionality for B1 shimming.\n\n\nMETHODS\nDW images of the abdomen were obtained on 1.5T and 3.0T (with and without two-channel functionality for B1 shimming) scanners on 150 patients (retrospective study population) and 10 volunteers (prospective study population). Eight regions were selected for clinical significance or artifact susceptibility (at higher field strengths). Objective grading quantified signal-to-noise ratio (SNR), and subjective evaluation qualified image quality, ghosting artifacts, and diagnostic value. Statistical significance was calculated using χ(2) tests (categorical variables) and independent two-sided t tests or Mann-Whitney U tests (continuous variables).\n\n\nRESULTS\nThe 3.0T using dual-source parallel transmit (dpTX 3.0T) provided the significantly highest SNRs in nearly all regions. In regions susceptible to artifacts at higher field strengths (left lobe of liver, head of pancreas), the SNR was better or similar to the 1.5T system. Subjectively, both dpTX 3.0T and 1.5T systems provided higher image quality, diagnostic value, and less ghosting artifact (P < 0.01, most values) compared to the 3.0T system without dual-source parallel transmit (non-dpTX 3.0T).\n\n\nCONCLUSION\nThe dpTX 3.0T scanner provided the highest SNR. Its image quality, lack of ghosting, and diagnostic value were equal to or outperformed most currently used systems.","claims":[{"public_id":"cl_980e8049bbe909ebca8807dda1994d78","status":"active","text":"Both dual-source parallel transmit 3.0T and the 1.5T MRI system provide higher image quality, greater diagnostic value, and less ghosting artifact than non-dual-source parallel transmit 3.0T, with most differences statistically significant (P < 0.01).","confidence":0.88,"contributors":[{"id":17,"public_id":"322360f1c1","public_label":"Killer Whale (322360f1c1)","roles":["extraction"],"url":"https://sah.borca.ai/u/322360f1c1"},{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["review"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_980e8049bbe909ebca8807dda1994d78"},{"public_id":"cl_f2cc29c5c1027927305bcdf521e15ecc","status":"active","text":"Dual-source parallel transmit 3.0T imaging provides significantly higher signal-to-noise ratio than the other compared systems in nearly all abdominal regions studied.","confidence":0.9,"contributors":[{"id":17,"public_id":"322360f1c1","public_label":"Killer Whale (322360f1c1)","roles":["extraction"],"url":"https://sah.borca.ai/u/322360f1c1"},{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["review"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_f2cc29c5c1027927305bcdf521e15ecc"},{"public_id":"cl_0709a67eb66762792461ec01d73ea11c","status":"active","text":"In the left lobe of liver and head of pancreas, regions prone to artifacts at higher field strengths, signal-to-noise ratio with dual-source parallel transmit 3.0T is better than or similar to the 1.5T MRI system.","confidence":0.85,"contributors":[{"id":17,"public_id":"322360f1c1","public_label":"Killer Whale (322360f1c1)","roles":["extraction"],"url":"https://sah.borca.ai/u/322360f1c1"},{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["review"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_0709a67eb66762792461ec01d73ea11c"}],"concepts":[{"public_id":"co_0ae79857cfbe1a7b3b36d31bd4ff8715","status":"active","name":"diagnostic value","description":"A subjectively rated measure of how useful the diffusion-weighted images were for diagnosis, assessed for each scanner system.","types":["outcome measure"],"aliases":[],"contributors":[{"id":17,"public_id":"322360f1c1","public_label":"Killer Whale (322360f1c1)","roles":["extraction"],"url":"https://sah.borca.ai/u/322360f1c1"},{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous 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