Week 11 Lecture 1 PDF

find more resources at oneclass.com Week 11 Lecture 1 November 21, 2018 Objectives • Types of mobile machines – general radiograph • Technological advancements – AEC, FPD Mobile vs Portable • Portable literally means that something that can be carried or moved easily, often in smaller size • Mobile...

find more resources at oneclass.com Week 11 Lecture 1 November 21, 2018 Objectives • Types of mobile machines – general radiograph • Technological advancements – AEC, FPD Mobile vs Portable • Portable literally means that something that can be carried or moved easily, often in smaller size • Mobile means something that is freely moveable Mobile X-ray • Requisition will state – mobile • Ordered by the referring physician • Often the patient is unable to make it to the department due to: injury (physical condition), surgery, emergency, and level of consciousness • Mobile cases take place throughout a technologists day or shift but are most common during the day shift and at the end of an overnight shift Mobile Exams • Test the technologists competence and skill • In surgery or the emergency unit, the stress of performing in a high-tension environment may be palpable • Patient problems often include limitations due to aseptic conditions and the presence of added critical equipment (ventilator, O2, cardiac lines, IV lines Demonstration of Air-Fluid levels Positioning • The use of a perpendicular beam is ideal although often a challenge due to the patients condition • Technologists must lift the patient in some instances on their own or ask for help from a nearby healthcare team member find more resources at oneclass.com find more resources at oneclass.com • Communication is key between patient, tech, and other members if available Mobile Unit • Newer models have a retractable telescope to permit a better view when in drive going to a from the patients location Battery powered • Standard incoming power supply used to charge a rechargeable battery or a series of batteries • Unit then draws its power supply from the battery independent of any outside connection • Best practice for all technologists is to charge the unit between cases so that next person or shift has access to a fully charged mobile unit Battery-Driven, Battery-Operated Mobile X-ray units • Use rechargeable, sealed, lead, acid-type 12V battries connected in series • Battery changing indicator. Maximum charge reached in 8 hours • Mobile units have variable travel speed and driving range of 10 miles • 2.5 mph – 3.0 mph • tech must be careful when driving Battery Powered • drive switch to move forward and reverse • easy turning capability although bulky • front drawer, head lined for CR cassettes or portable detector Capacitor Discharge Mobile Units • Lighter, smallers, easy to use • Capacitor is charged, the holds charge until exposure • Requires more frequent charging (before each use) o Charge time much faster • Technical issues → unable to handle larger exposures as well as bettery o As capacitor discharges experience voltage drop AEC • • • • Available for most mobile units Paddle ionization chamber Positioned behind the cassette Positioning is critical Mobile CXR find more resources at oneclass.com find more resources at oneclass.com Markers – Very Important • Note in slide 14 the use of markers • The side marker contains a series of numbers identify the technologist • Supine tells the radiologist that the patient was unable to sit up and there will be an impact on air-fluid levels • A “portable” marker is required to fully demonstrate the case was not performed in the department Distance- Accuracy Required • 40” SID – due to room configuration, C shows air/fluid best, B,C will create magnification of the heart • 56” – if limited space • 72”- best space • D best, A okay to decrease magnification, but does not show air fluid well Grids – Tube must be perpendicular to IR, and centered to the grid Ratio usually lower than in department Wide Range of Arm Positions • Be mindful to lock the tube in place when the exam is complete to avoid injury to tech or to those nearby Pediatric find more resources at oneclass.com find more resources at oneclass.com Mobile X-ray in a Nursing Home • X-ray mobile goes out to nursing homes and correctional facilities. • Tech drives the van and goes from location to location every day • Interesting work Mobile with FPD Mobile with Flat Plate Detector (FPD) • Touch screen – capability to export to PACS • Detector size • Anatomical programming • Manual technique capabilities Mobile with FPD (Digital) Mobile with FPD Mobile with FPD • Scintillator + amorphous silicon (a-Si) • 2208 x 2688 pixels (dexels) (5.9 million pixels) • 4096(12-bit) grayscale • 175 lbs / 79 kg Wireless Detector System find more resources at oneclass.com find more resources at oneclass.com find more resources at oneclass.com