JOURNAL ARTICLE

Changes in excision cavity volume: prediction of the reduction in absolute volume during breast irradiation

Robbert J H A Tersteeg, Judith M Roesink, Miriam Albregts, Carla C Wárlám-Rodenhuis, Bram van Asselen
International Journal of Radiation Oncology, Biology, Physics 2009 July 15, 74 (4): 1181-5
19117693

PURPOSE: The aim of this study was to determine the changes in the excision cavity volume due to the resolution of the surgical effects during the whole breast treatment.

MATERIALS AND METHODS: Seventy-seven patients with early-stage (T1-2 N0) breast cancer treated with breast-conserving therapy were included for this study. All patients underwent a standard planning computed tomography (CT) scan before irradiation treatment. A second CT scan was performed in the week before the start of the boost. Excision cavity volumes were delineated based on the surgical clips and the (surrounding) seroma or hematoma or other surgical changes on both scans by an experienced physician. This resulted in the gross tumor volumes GTV1 and GTV2.

RESULTS: The delineated volumes of the GTVs were on average 78.7 cm(3) (range, 1.1-236.0 cm(3)) and 29.7 cm(3) (range, 1.3-123.6 cm(3)) for, respectively, GTV1 and GTV2. The time between the CT scans was on average 37 days (range, 29-74 days). This resulted in a reduction of on average 62%. The absolute reduction per day of the GTV1 was -1.3 cm(3)/day (range, 0.3 to -5.4 cm(3)/day). A linear correlation (correlation coefficient r(2) = 0.81) was observed between the absolute volume of GTV1 and the absolute reduction per day.

CONCLUSION: A significant reduction in excision cavity volume during whole breast irradiation was shown. The observed correlation might be helpful in the decision to perform a second CT scan to adapt the treatment plan.

Full Text Links

Find Full Text Links for this Article

Discussion

You are not logged in. Sign Up or Log In to join the discussion.

Related Papers

Remove bar
Read by QxMD icon Read
19117693
×

Save your favorite articles in one place with a free QxMD account.

×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"