title: A simple method for labeling CT images with respiratory states.
abstract: A method is described for labeling CT images with their respiratory state by a needle, connected to the patient's chest/abdomen. By means of a leverage the needle follows the abdominal respiratory motion. The needle is visible as a blurred spot in every CT slice. The method was tested with nine patients. A series of volume scans during free breathing was performed. The detected positions of the moving needle in every single slice were compared to each other thus enabling respiratory state assignment. The tool is an inexpensive alternative to complex respiratory measuring tools for four dimensional (4D) CT and was greatly accepted in the clinic due to its simplicity.
authors.affiliation: Technische Universität München, Image Understanding and Knowledge-Based Systems, Boltzmannstr 3, D-85748 Garching bei München, Germany. berlinge@in.tum.de
authors.forename: Kajetan
authors.initials: K
authors.lastname: Berlinger
authors.forename: Otto
authors.initials: O
authors.lastname: Sauer
authors.forename: Lucia
authors.initials: L
authors.lastname: Vences
authors.forename: Michael
authors.initials: M
authors.lastname: Roth
mesh_terms: D000465:Algorithms; D016477:Artifacts; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000295:instrumentation* / Q000379:methods; D016247:Information Storage and Retrieval / Q000379:methods; D009068:Movement; D009339:Needles; D011856:Radiographic Image Enhancement / Q000295:instrumentation* / Q000379:methods; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000295:instrumentation / Q000379:methods; D015203:Reproducibility of Results; D015656:Respiratory Mechanics; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed / Q000379:methods*