volume_reconstruction: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/lib/cmtk/bin/volume_reconstruction - from package: cmtk

You may install the required package with command apt-get install {package}

Error in other languages:
volume_reconstruction: bevel nie gevind nie
volume_reconstruction: comandă negăsită
volume_reconstruction: comando não encontrado
volume_reconstruction: commande introuvable
volume_reconstruction: command not found
volume_reconstruction: käsku ei ole
volume_reconstruction: không tìm thấy lệnh
volume_reconstruction: komanda nerasta
volume_reconstruction: Kommando nicht gefunden.
volume_reconstruction: kommandot finns inte
volume_reconstruction: komut yok
volume_reconstruction: nie znaleziono polecenia
volume_reconstruction: níor aimsíodh an t-ordú
volume_reconstruction: no se encontró la orden
volume_reconstruction: no s'ha trobat l'ordre
volume_reconstruction: opdracht niet gevonden
volume_reconstruction: parancs nem található
volume_reconstruction: perintah tidak ditemukan
volume_reconstruction: príkaz nenájdený
volume_reconstruction: příkaz nenalezen
volume_reconstruction: команда не найдена
volume_reconstruction: командата не е открита
volume_reconstruction: 命令找不到
volume_reconstruction: コマンドが見つかりません