Leading Canadian Pediatric Hospital Continues to Drive Dose Down for Sick Children
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1 Leading Canadian Pediatric Hospital Continues to Drive Dose Down for Sick Children At Canada s premier pediatric hospital also recognized as one of the world s foremost pediatric healthcare institutions new CT imaging protocols are lowering patient exposure to ionizing radiation. The clinicians at The Hospital for Sick Children (SickKids) in Toronto, Ontario, treat some of the most seriously ill children in Canada. In 2009, SickKids became the first pediatric hospital in that country to install the Discovery* CT750 HD, the world s first high definition CT system. For Guila BenDavid, Manager CT Scan, PET/CT, and Nuclear Medicine, and Karen Thomas, MB, BCh, MA, MRCP, FRCR, FRCP(C), radiologist, the speed, workflow, and flexibility of the system were the key reasons why they believed it was the right CT scanner for their hospital. However, GE Healthcare s commitment to lowering CT dose in pediatric patients tipped the scale. According to BenDavid, the hospital s typical imaging pathway starts with trying to answer clinical question(s) with non-ionizing examination techniques such as ultrasound. However, if CT is ultimately the best option for the patient, the hospital balances dose and image quality to obtain the information required for patient diagnosis or management. With any new CT scanner comes new and improved capabilities, but users need to optimize technical settings in order to maximize its diagnostic ability for their patients, says Dr. Thomas. We didn t just transpose our protocols from our previous scanner to this new one. Rather, we wanted to take advantage of the scanner s advanced technology for thin slice acquisition and improved Z-axis resolution, utilize the Smart ma/auto ma, and incorporate ASiR*. So we essentially started from scratch to develop our new pediatric body CT protocols. Adds BenDavid, We bought a scanner with advanced capabilities, so what would be the purpose of utilizing it like an older scanner, using thick slice acquisition? We were very conscious of dose considerations. We wanted the best of both worlds advanced imaging capabilities at the lowest possible dose. And so began what became a year-long process of intensive development and evaluation of new protocols at SickKids, which continues today with further modifications in dose-lowering techniques. 19
2 Pediatric Imaging A B Figure 1A, B. Coronal MPR images from a routine CT chest/abdomen/pelvis on a nine-year-old child (22.5 kg) showing simultaneous multicompartmental vascular opacification using a newly developed, dual bolus, intravenous contrast injection technique. Low attenuation liver was attributed to fatty change. Scan performed at 100 kvp using AutomA, Noise Index 20, and 30% ASiR. CTDI vol 3.8 mgy, DLP 199 mgy cm, Effective dose estimate 4.7 msv (using pediatric conversion coefficients, Kalender 2010). Protocol development and evaluation Optimizing protocols to achieve ALARA is more challenging in pediatrics than in adults, explains Dr. Thomas. Pediatric patients vary in size from the smallest newborn baby to adult-sized teenagers. Depending on age, torso shape also evolves from almost cylindrical in infants to more oval-shaped in school-age children and then to adult morphology in teenagers, and this must be taken into consideration when using the Smart ma/ Auto ma system. Children tend not to have much abdominal fat, which impacts image contrast. Finally, children can have difficulty staying still in the scanner and so system speed and adaptability are important. These factors combined require a large number of gradations in scanning parameters. For the first six months after installing the new system, the team underwent an empirical process involving day-to-day observations of protocol adaptations based on four iterations of routine chest and abdominal scanning protocols. With each iteration, the staff reviewed the protocols and evaluated various aspects for each weight group, including: image quality, the pattern of tube current modulation as assessed by the console-displayed ma Table, and dose as indicated by the Dose Length Product (DLP). These efforts were supplemented by work with anthropomorphic phantoms to further investigate choice of pitch and the impact of scan length on beam width selection. As a result of these observations, Our knowledge of how this scanner worked and the impact of altering different technical parameters considerably increased, says Dr. Thomas. For example, before scanning a patient, the technologists could see how the Smart ma/auto ma system was going to adapt to the patient s size and shape. With each patient, the technologist recorded how the ma table behaved for a specific Noise Index level, noting the highest and lowest ma and the pattern of modulation achieved. From this process alone, the technologists learned that they should be paying attention to the projected pattern of tube current modulation and DLP, says BenDavid. They could determine if the DLP was too high or if modulation was not going to be optimal even before starting the scan. By the end of the first year of evaluation, SickKids developed new protocols for the Discovery CT750 HD that took into account differences in patient size and shape. The new protocols also better utilized the system s wide array of capabilities. Their body CT protocols include 12 weight categories from newborn to over 100 kg, with adaptations in kvp (small children are now scanned at 80 or 100 kvp and older children and teenagers at 120 kvp), Smart ma/auto ma parameters, detector width, and acquisition field of view (FOV). 20 A GE Healthcare CT publication
3 Figure 2. It is important to put young patients at ease prior to a CT scan. A critical element, says Dr. Thomas, was the settings for the Automatic Exposure Control. There are five parameters that can be prescribed the Noise Index, minimum ma, maximum ma, and whether to use Smart ma, Auto ma, or both. Each of these elements requires optimizing for each weight group or patient shape, she explains. Adds BenDavid, Because it was not implemented on our previous scanner, it was a substantial learning curve on our part to learn how to use it to its maximum potential. SickKids realized that greater image noise can be tolerated as patient size increases and so they developed a scale of Noise Indices based on patient size, specific to chest or abdomen, and designed for use with thin collimation scanning. Their final protocols take a variable approach to infants, small children, larger children, and teenagers although as Dr. Thomas notes, protocols are never final; we are always looking to further improve them. In infants they found a set ma approach more effective, and they use tube current modulation for children over 12 kg. The rise in ma, which can increase dose through the pelvis in older children, is a known result of dose modulation systems and was addressed by prescribing maximum ma settings to specifically limit this. Another practical point we learned was to be meticulous in prescribing the coverage of the scan when using the Smart ma/ Auto ma because the highest ma values were often at the periphery of our scan region, says Dr. Thomas. Unnecessary additional coverage of a few centimeters can have a significant dose impact, which might be up to 10% of the total dose to a child. The technologists learned to be as precise as possible in determining scan coverage, BenDavid adds. Detector beam width was tailored to patient size. Based on phantom studies and patient projected DLP studies, on systems without dynamic Z-axis tracking and with a scan length above 20 to 25 cm, the DLP is similar when using a 40 mm beam width or a 20 mm beam width. However, below this scan length, the DLP is lower using a 20 mm beam width, and therefore this became the preferred beam width for short coverage cases where scan time was not critical. We looked at the typical scan length for chest and abdomen examinations in various patient weight categories and incorporated this knowledge into our protocols, says Dr. Thomas. Since the acquisition FOV determines the selection of bowtie filter and maximum kw tube output, it was necessary to select the scan FOV according to patient size in order to maximize image 21
4 Pediatric Imaging quality, adds Dr. Thomas. Our goal was to push the scanner as far as possible to lower dose and optimize our protocols before adding ASiR. The last consideration before ASiR was the administration of intravenous contrast for extended length scans such as chest, abdomen, and pelvis. By creating a robust protocol using the Smart ma/auto ma system, we can scan the chest and abdomen in one helical acquisition at a lower dose compared to our previous two-helical technique, says Dr. Thomas. We designed a new dual bolus technique, with two boluses of contrast separated by a saline flush. With this injection technique and a single helical scan, we can now achieve simultaneous pulmonary arterial, systemic arterial, and portal venous vascular opacification, which has further improved our image quality. Adding ASiR to the mix Finally, ASiR^ was added to the protocol development mix. Although the implementation of ASiR at SickKids is still a work-in-progress, the team has been able to increase Noise Indices to obtain further dose savings. Typically, SickKids uses between 20% and 50% ASiR for body CT examinations, increasing the percentage with patient size. With continued phantom evaluations, Dr. Thomas anticipates obtaining more objective data on the effect of varying blends of ASiR over a range of kvp and ma settings in order to facilitate a more structured approach to increasing its use in clinical practice. Figure 3. 3D angiogram of the hand in an infant with severe soft tissue and bony fusion (syndactyly), demonstrating detailed anatomy of the digital arteries for pre-operative planning. Scan performed at 80 kvp, 60 mas, CTDI vol 7.2 mgy, DLP 75 mgy cm (16 cm phantom). Advances in CT angiography In addition to routine body scanning, the team at SickKids has been pleased with the improvement in image quality of the CT angiograms that they can now provide to referring physicians. We have been able to develop new clinical applications, says ^In clinical practice the use of ASiR may reduce patient CT dose depending on the clinical task, patient size, anatomical location and clinical practice. A consultation with a radiologist and a physicist should be made to determine the appropriate dose to obtain diagnostic image quality for the particular clinical task. One of the greatest advantages of this GE scanner in pediatric imaging is the degree to which we can prescribe changes to each protocol parameter, especially the degree to which the Smart ma/auto ma parameters are user defined. Dr. Karen Thomas 22 A GE Healthcare CT publication
5 Dr. Thomas, including high resolution images of very small vessels such as the digital (hand) arteries in babies. Notable results The leap to the Discovery CT750 HD provides a noticeable difference in image quality, and the ability to design and tailor protocols was another tremendous advantage of the new system at SickKids. One of the greatest advantages of this GE scanner in pediatric imaging is the degree to which we can prescribe changes to each protocol parameter, especially the degree to which the Smart ma/auto ma parameters are user defined, says Dr. Thomas. Other features stand out as beneficial for the team at SickKids, including the protocol password protect particularly useful when technologists are unfamiliar with the Discovery CT750 HD. Another key benefit, says BenDavid, is the user interface and ability to move from screen to screen very quickly. System speed is very important when scanning children who often move during a scan, and thus may have required sedation. Similarly, GE Healthcare provides reliable and timely support; BenDavid found GE responds quickly to support requests, especially when the ilinq is utilized. It s not always just about the end product, but what it takes to get there, BenDavid says. Dr. Thomas adds, GE Healthcare helped us achieve the low doses we wanted. We had the impression that our work was also a key priority for GE. The adaptation of imaging protocols to children of all ages has long been the philosophy of SickKids Diagnostic Imaging Department. BenDavid explains, As new technology emerges, we strive to make it available to our patients, while ensuring that we optimize and adapt it to achieve the best balance of image quality and radiation dose for the particular needs of children. Thanks to the collaboration with GE and dedicated effort of the entire imaging team at SickKids, their new CT scanner has become a successful part of realizing this philosophy. Karen Thomas, MB BCh MA MRCP FRCR FRCP(C), Radiologist, Hospital for Sick Children, Modality Lead, Body CT, Assistant Professor, University of Toronto. Dr. Karen Thomas graduated from the University of Oxford Medical School, England and obtained the Membership of the Royal College of Physicians (Paediatric) in 1993, Fellowship of the Royal College of Radiologists, UK in 1998 and the Fellowship of the Royal College of Physicians and Surgeons of Canada in She has been a member of the body imaging group at the Hospital for Sick Children, Toronto, Canada since She has developed a wide-ranging research interest in the practical, strategic, and educational aspects of radiation safety and dose reduction in pediatric imaging with clinical impact on dose reduction and optimization of practice within the diagnostic imaging department at SickKids in addition to contributing toward current international efforts to improve physician, manufacturer, and public awareness. Dr. Thomas has received several Caffey awards from the Society for Pediatric Radiology for her work. She has been an invited speaker on various aspects of pediatric radiation safety, including participation in the Image Gently 2011 ALARA CT Dose Reduction Conference, keynote radiation safety speaker at the 2011 International Pediatric Radiology Congress, and presentations to the Ontario Hospitals Association, Ontario Association of Radiologists and Radiological Society of North America. Guila BenDavid, MRT(R), Manager CT, Nuclear Medicine, PET/CT, Diagnostic Imaging. BenDavid joined SickKids in 1990 and in 1996, assuming the role of CT Manager. In 2010, BenDavid also took on the role of Manager in the Nuclear Medicine department BenDavid is a member of several committees throughout SickKids and is considered a leader in Canada for radiation dose reduction. Acquiring optimal images without administering more radiation than necessary is a priority for BenDavid. She provides education to her Child Health Network colleagues and beyond through lectures at conferences, and educational facilities. BenDavid has shared her expertise around the world with prestigious institutions throughout the US and Canada, as well as in the UK, Turkey, Brazil, and India. BenDavid has been very involved in the Ontario government s initiative to reduce CT dose for pediatric patients, and is consulted by other centers to provide expert advice in pediatric protocols. The Hospital for Sick Children (SickKids) is recognized as one of the world s foremost pediatric healthcare institutions and is Canada s leading center dedicated to advancing children s health through the integration of patient care, research, and education. Founded in 1875 and affiliated with the University of Toronto, SickKids is one of Canada s most researchintensive hospitals and has generated discoveries that have helped children globally. Its mission is to provide the best in complex and specialized family-centered care; pioneer scientific and clinical advancements; share expertise; foster an academic environment that nurtures health-care professionals; and champion an accessible, comprehensive and sustainable child health system. SickKids is proud of its vision for Healthier Children. A Better World. For more information, please visit 23
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