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Influence of volumes of prostate, rectum, and bladder on treatment planning CT on interfraction prostate shifts during ultrasound image-guided IMRTa)
a)Presented at the 49th Annual Meeting of the American Association of Physicists in Medicine, July 22–July 26, 2007, Minneapolis, MN.
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10.1118/1.3260840
/content/aapm/journal/medphys/36/12/10.1118/1.3260840
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/36/12/10.1118/1.3260840
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Mean prostate shifts in the right and left (−) lateral directions on treatment days vs bladder volume on CT day (no correlation, , , and ). Each data point is the mean of 25–45 shifts for a given patient. SD is not shown for the sake of clarity. Anterior/posterior and superior/inferior prostate shifts on treatment days vs bladder volume on CT day were also not correlated (, data not shown).

Image of FIG. 2.
FIG. 2.

Mean prostate shifts in the anterior and posterior (P, −) directions on treatment days vs prostate volume on CT day were not correlated . SD is not shown. Right and left (−) lateral prostate shifts on treatment days vs prostate volumes on CT day were also not correlated (, data not shown).

Image of FIG. 3.
FIG. 3.

Anterior-superior expansion of prostate and bladder due to enlargement in their size. Magenta—prostate (p), blue—SV, pink—rectum (r), and cyan—bladder (b). Left panel: The superior distance from isocenter to base (superior aspect) of a small prostate is 2 cm. Volumes: P-39 cc, SV-10 cc, R-123 cc, and B-192 cc. Right panel: The superior distance from the isocenter to the base (superior aspect) of a large prostate is 5 cm. Volumes: P-154 cc, SV-23 cc, R-179 cc, and B-201 cc. The inferior distance from the isocenter is nearly the same for both cases, 2.5 cm. The figures in the left and right panels are for two different patients.

Image of FIG. 4.
FIG. 4.

Mean prostate shifts in anterior and posterior (P, −) directions vs rectal volume on CT day (correlated, ). Each data point is the mean of 25–45 shifts for a given patient, shown with SD of the mean. Mean anterior and posterior (−) prostate shifts vs cross sectional area of rectum on CT day were also correlated (, data not shown).

Image of FIG. 5.
FIG. 5.

A dramatic illustration of prostate IGRT: Magenta—prostate (p), blue—SVs, pink—rectum (r), and cyan—bladder (b). Left panel, top—patient was set up using skin marks. Bottom-right lateral beam’s eye view (BEV) is shown with 1 cm margin to prostate and SV. The rectal volume was 145 cc. Middle panel with a new CT scan with a large rectum (395 cc). Top—the patient was set up using skin marks. Bottom—right lateral (BEV) with the same port is shown. The prostate and SV have moved superiorly and anteriorly. Parts of the prostate and SV are outside the port anteriorly and superiorly, resulting in a geometric miss. Right panel—with the new CT scan with a large rectum and after couch shifts in the inferior (0.8 cm) and posterior (1.5 cm) directions. Top—the patient was setup using skin marks and shifts were made. Bottom—right lateral BEV with the same port is shown. Most of the prostate and SV are in the field.

Image of FIG. 6.
FIG. 6.

Mean prostate shifts in superior (S, ) and inferior (I, −) directions on treatment days vs bladder volume on CT day (no correlation, , , and ). Each data point is the mean of 25–45 shifts for a given patient. SD is not shown for the sake of clarity.

Image of FIG. 7.
FIG. 7.

(a) Mean prostate shifts in superior (S, ) and inferior directions (I, −) vs prostate volume on CT day (correlated, ). Each data point is the mean of 25 –45 shifts for a given patient. SD is not shown for the sake of clarity. (b) Distance between the isocenter and prostate base on CT day vs mean prostate shifts in the superior (S, ) and inferior (I, −) directions (correlated, ). Each data point is the mean of 25–45 shifts for a given patient, shown with SD of the mean.

Image of FIG. 8.
FIG. 8.

Relationship between prostate volumes on CT day vs distance between the prostate base and the isocenter (correlated, ).

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/content/aapm/journal/medphys/36/12/10.1118/1.3260840
2009-11-11
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Influence of volumes of prostate, rectum, and bladder on treatment planning CT on interfraction prostate shifts during ultrasound image-guided IMRTa)
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/36/12/10.1118/1.3260840
10.1118/1.3260840
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