TY - JOUR
T1 - Preliminary retrospective analysis of daily tomotherapy output constancy checks using statistical process control
AU - Mezzenga, Emilio
AU - D'Errico, Vincenzo
AU - Sarnelli, Anna
AU - Strigari, Lidia
AU - Menghi, Enrico
AU - Marcocci, Francesco
AU - Bianchini, David
AU - Benassi, Marcello
PY - 2016/2/1
Y1 - 2016/2/1
N2 - The purpose of this study was to retrospectively evaluate the results from a Helical TomoTherapy Hi-Art treatment system relating to quality controls based on daily static and dynamic output checks using statistical process control methods. Individual value X-charts, exponentially weighted moving average charts, and process capability and acceptability indices were used to monitor the treatment system performance. Daily output values measured from January 2014 to January 2015 were considered. The results obtained showed that, although the process was in control, there was an out-of-control situation in the principal maintenance intervention for the treatment system. In particular, process capability indices showed a decreasing percentage of points in control which was, however, acceptable according to AAPM TG148 guidelines. Our findings underline the importance of restricting the acceptable range of daily output checks and suggest a future line of investigation for a detailed process control of daily output checks for the Helical TomoTherapy Hi-Art treatment system.
AB - The purpose of this study was to retrospectively evaluate the results from a Helical TomoTherapy Hi-Art treatment system relating to quality controls based on daily static and dynamic output checks using statistical process control methods. Individual value X-charts, exponentially weighted moving average charts, and process capability and acceptability indices were used to monitor the treatment system performance. Daily output values measured from January 2014 to January 2015 were considered. The results obtained showed that, although the process was in control, there was an out-of-control situation in the principal maintenance intervention for the treatment system. In particular, process capability indices showed a decreasing percentage of points in control which was, however, acceptable according to AAPM TG148 guidelines. Our findings underline the importance of restricting the acceptable range of daily output checks and suggest a future line of investigation for a detailed process control of daily output checks for the Helical TomoTherapy Hi-Art treatment system.
UR - http://www.scopus.com/inward/record.url?scp=84959227180&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84959227180&partnerID=8YFLogxK
U2 - 10.1371/journal.pone.0147936
DO - 10.1371/journal.pone.0147936
M3 - Article
VL - 11
JO - PLoS One
JF - PLoS One
SN - 1932-6203
IS - 2
M1 - e0147936
ER -